AI Character Replacement Tools: Keep the Performance, Choose the Right Edit

Compare character-replacement tools by the shot you need

Start with Dreamina for character development and reference-led creative video. For an existing edit, compare the source-video controls before choosing a model or buying credits.

What does keeping the original motion mean?

Decide separately whether you need the same action, the same timing and the same scene. These demands can lead to different workflows even when the prompt is simply “replace this person.”

A source-video edit uses the existing shot as the scene and changes a person within it. This is the natural starting point when the camera, room, other actors or an object interaction are already right. Generative editing can still redraw surrounding detail, so inspect the complete shot rather than assuming that everything outside the person is untouched.

Motion or performance transfer uses a driving clip to animate another character. Its reference image may supply a different setting, body shape and composition. This works well for a mascot borrowing a gesture or an original character performing your acting. It can also reconstruct the background and camera framing.

CG actor replacement applies an actor's tracked movement to a rigged character and continues through a 3D production workflow. It takes more preparation, but gives a team animation and scene assets to refine instead of only a rendered clip.

For a person handing over a cup, list the requirements: the hand reaches the cup, the fingers meet the handle, the cup moves at the correct moment and the new body does not intersect the counter. That list is more useful than asking for “the exact same motion” without specifying what a successful shot looks like.

1. Dreamina: develop the character and its reference-led performance

Start with a readable character reference: face, silhouette, clothes and any prop that must remain recognizable. In Dreamina, choose a video mode that accepts the inputs your shot requires, then assign each reference a job. State which image defines the character, which clip supplies the action and whether the location should follow the video or become a new scene.

For a reference-led generation, keep the brief concrete: “The cream delivery robot from the character image raises its blue hand in a greeting, following the reference performance. Keep the yellow backpack visible.” Add the setting and camera instructions appropriate to your intended new shot. For an existing clip, Seedance 2.5 supports local-editing workflows where available: identify the target, requested replacement and effective time range. A motion-reference setting and a local edit do different work.

The example below uses a paid Recreate Lite Motion transfer output at 720p. A cyclist's wave provides the action, and a cream robot provides the replacement design. The result carries a recognizable greeting into a rainy street scene, while the robot's proportions, hand trajectory, bicycle and framing differ from the driving shot. It is a useful creative mascot performance; choose a source-editing route when the original shot's geometry must remain.

Driving performance

Replacement character reference

Dreamina performance

Review the turn, hand position and contact points before refining the visual style. For a new scene driven by an existing performance, our character animation with motion references guide develops the input preparation further. For commercial work, confirm the permission that applies to your market, selected model and plan.

2. Runway: edit the shot or capture a new performance

For an existing shot, open Runway Edit Studio and upload the video. Select a keyframe where the person is clearly visible, describe the replacement and attach a character reference where needed. Preview the image first; fix identity and composition before generating the video. Leave Extra Motion off when the original action already works. This avoids spending a full video render on a reference face or costume that is wrong in the still preview.

The current Edit Studio workflow uses Single edit. Keep the initial change focused on the person; combine additional changes after the replacement works. Inspect the full result for background, camera and prop drift, especially where the new costume changes the subject's outline.

Act-Two belongs to a separate performance route. With a character image, Gestures can transfer body and hand action; with a character video, its original body and camera movement remain and the driving performance transfers facial expression. A character video shorter than the performance can reverse and loop to cover it.

Use one visible performer, a clear face and a similar starting pose. For an image-driven gesture, begin with hands in frame. Facial Expressiveness starts at 3; lowering it can help consistency, while increasing it can add expression and artifacts. Act-Two requires Standard or higher. Choose it for acting a new character, and Edit Studio when the existing shot is the material you want to revise.

3. Higgsfield Genjutsu: choose Object Swap or Motion Transfer

Choose Genjutsu when its explicit mode split matches your decision. Object Swap targets an element in the source; Motion Transfer builds a new shot around the reference performance. Select the mode before writing a prompt so the character photos and scene instructions support the same result.

The full Genjutsu workflow accepts a 4–30-second clip and up to 30 reference images. Upload views that explain the character's relevant angles rather than filling every slot with near-identical portraits. Its optional Style control belongs to Motion Transfer; the prompt can be enabled when you need further direction. Genjutsu Lite is a separate simplified workflow, with different reference limits and no equivalent mode choice.

For an Object Swap, start with a clear actor and one replacement. Check turns and the outline against the original scene. A prompt to keep the room unchanged is useful direction, but the rendered shot still needs inspection. Website Unlimited access depends on whether the selected model is included in the plan; external integrations use a different credit route. Check the selected mode and quote before rendering.

4. Viggle: swap a body, with a separate route for several people

Viggle's Body Swap workflow takes a character photo and a template or your own video. It is a direct starting point for a dance, greeting or short body-performance idea. Use a clear front view with the body visible enough to describe the costume and proportions that the movement will reveal.

For several replacements, look at MultiTrack, a separate current workflow supporting up to seven characters or objects. Assign each identity deliberately and inspect crossings between subjects. A convenient group interface does not remove the difficulty of hands passing in front of another body or two people sharing the same part of the frame.

Viggle Animate's research approach offers another useful preparation idea: repaint a frame from the actual driving clip, keeping its pose, lighting and setting, then condition the video on that edited frame. Preparing that frame is part of the job. The research model's documented difficulties with lip movement, cuts and close interactions should guide shot selection; they are not a blanket description of every current Viggle product. Choose a simple continuous performance first, then review the entire result.

5. Kling AI: distinguish Motion Control from video editing

Kling Motion Control pairs a character image with a driving clip. Match half-body to half-body or full-body to full-body, with room for the limbs to move. Use a continuous, clearly visible performer. The native guide accepts 3–30-second motion references and warns that fast or complex movement can produce a shorter extracted action; those completed generations still consume credits.

Character Orientation Matches Video follows the driving orientation; Matches Image uses the character image's orientation and permits camera direction through the prompt. On 3.0, facial Element binding requires Video orientation. It references facial information, not costume, hairstyle or props. Supply face angles and expressions relevant to the action, and inspect the clothing separately. Motion Control is not a general simultaneous group replacement: the main subject's frame presence matters.

For a source-video replacement, use the separate video-editing path. The native O1 guide describes changing a named subject in a video to a target from an image or Element; the 3.0 Omni guide says its video-editing features follow that approach. Name the person by visible clothing or position and identify the replacement reference. Do not use a new-scene motion instruction when you want an edit of the existing shot, or assume that a hosted Kling workflow has the same limits as the native mode.

6. Luma Ray3.2: balance appearance changes against source structure

Luma's Ray3.2 Modify Video V2 is useful when you want a different character appearance within a video-driven shot. Choose Modify, select Ray3.2 and supply the source clip and the relevant character guidance. Motion and Structure controls let you balance the change against the source. Increase the freedom to change appearance when the new character remains too similar to the original; use stronger structural restraint when the composition begins to drift.

Character Poses and Blocking address different needs. Think about whether you are trying to guide a pose or preserve where the subject moves through the scene. Face Tracking can help a dialogue-oriented shot, but inspect the mouth through turns and occlusion.

The maximum source length depends on frame rate: 20 seconds at 24 fps, 15 seconds at 30 fps or 7 seconds at 60 fps. Choose a clean, readable segment within the appropriate limit. Dark faces, chaotic camera movement and crowded overlap make identity and structure harder to follow. Review the motion and character together before adding more appearance changes.

7. Magic Hour: select the person before committing the render

Magic Hour's Character Replace workflow distinguishes Replace person from Animate image. Choose the model and mode first, then add Video To Edit and Character To Use. If the chosen combination offers manual person selection, move to a frame where the subject is visible and select that person.

After changing the trim, recheck the selected points. Points outside the new segment are excluded; reselect the person if none remain inside. This is particularly useful to remember when the wrong person changes after shortening a crowded shot.

The available duration is model-specific. For example, the guide's Kling replacement and animation modes have different limits from its MiniMax H3 options. A free-account duration restriction is another condition, separate from the model's own maximum. Check all three: model, mode and your account's available access. Use this route when the visible subject-selection workflow fits the source, then inspect turns and overlap before extending the edit.

8. Fliki: swap a character and finish the narrated edit

Fliki's dedicated Character Swap can suit a replacement that will become a narrated social clip. Upload a source of up to 30 seconds, choose the person when several appear and provide a clear character image. A front view in even light gives the model a more useful identity reference than a small face hidden behind hair or a prop.

Once the swap works, continue in Fliki's editor for voice, lip sync, captions, music and other finishing. Keeping those steps together can be useful when the deliverable is a complete short video rather than a standalone replacement shot.

Character Swap is a paid-plan feature. General free access to the wider product does not make this particular render free. Check the run's credit requirement before generating. If you are changing dialogue as well as appearance, finish the identity and movement first, then choose the new voice and review the mouth against it. This keeps a speech problem from being confused with an identity problem.

9. MiniMax H3 Recast in Fuser: map several new people to a source edit

Fuser's MiniMax H3 Recast node is a useful option when a source sequence needs several new identities. It takes a 5–30-second video, with no individual shot longer than 15 seconds, and a photo for each replacement person, up to four. The default mapping follows the people from left to right; an explicit instruction can override it.

Write the mapping in plain visual terms: “The woman in the yellow coat replaces the person at the left counter; the man with glasses replaces the person behind the till.” Check the photo order before rendering, especially when two replacements have similar clothes.

The node offers 768p and 1080p, with a higher quote for the higher resolution. Trim unused material first. Recast carries the source soundtrack, so a visibly different character can still speak in the original performer's voice. Decide whether that is intentional. This dedicated Recast node and a general H3 reference-generation node have different input rules; choose the workflow that matches your finished source edit.

10. Autodesk Flow Studio: replace the actor with an editable CG character

Choose a CG workflow when you need to refine the performance as animation or continue in a 3D scene. Autodesk Flow Studio combines actor assignment and character retargeting with production-oriented outputs. A compatible rigged character is a different starting asset from a single portrait.

Retargeting matters because the replacement may have longer legs, shorter arms or a very different torso. Use Character Scale and the relevant feet or wrists IK alignment to work on contact. Large proportion differences can stretch the pose; a hand reaching the same place in space may no longer form a natural arm shape.

The guide distinguishes pelvis alignment toward the feet from alignment toward the neck, which can matter when only part of a body is visible. Work on the tracked performance and the asset together. This route is valuable when the team needs editable animation and scene handoff; it is more preparation than uploading a character photo for a quick social variation. Check feet, hands, scale and camera alignment before final lighting and rendering.

11. Sogni: choose which input supplies the scene

Sogni exposes the important distinction directly in its Mac workflow. Motion Transfer animates a character within the image's scene. Replace uses the video's scene and changes the character. Select the mode according to which input should control the setting.

In Sogni Create, open Video creation and Motion Transfer, add the character image and source video, then choose the intended mode and a compatible model. A prompt can clarify the replacement, particularly in Replace mode. Match the image's angle, character size and aspect ratio to the video so the model does not have to invent a very different body placement.

Begin with a short readable action and inspect it before assembling more shots in Clip Mixer. Reusing a seed can help organize iterations, but it does not lock every identity detail or make an awkward source pose correct. This is a useful route for Mac creators who want the scene-source choice visible in the workflow.

12. Pika Swap Anything: a focused prompt-and-reference edit

Pika's current Swap Anything video tool provides a direct source-clip workflow. Upload the clip, describe what should change and add reference images when needed. The page separates choices such as characters, outfits, locations and products, which helps keep the scope clear.

For a person replacement, name the source person and the reference identity. If the costume and body must change too, say so. If you only need a different jacket, keep that narrower task rather than asking the model to reinvent the whole character.

Generate, compare with the original and inspect the difficult turn or contact. Check the selected model's quote and the feature's availability in your account before committing. This route is useful for a concise, instructed edit; a complex interaction with exact hand-to-object contact may still need a more controlled compositing finish.

13. Pruna P-Video-Replace through Runware: automate a reference-driven swap

Pruna P-Video-Replace through Runware is suited to an API or playground workflow. Supply the source video and one to three character references. Those images can show different views of one character or define several new characters; write an explicit mapping when their roles would otherwise be ambiguous.

For automation, save the source identifier, reference order, prompt and chosen settings with each job. A consistent request structure makes a failed identity assignment easier to diagnose than a folder of unlabeled outputs.

Audio handling has two separate controls: preserving the source audio and using it to drive mouth synchronization. Decide each deliberately. Stylized or simplified mouths can need another synchronization pass even when the original sound remains. The guide also warns about hard turns, hidden faces and fast camera changes: give the model a readable identity anchor rather than expecting an unseen face to remain stable. Choose this route when repeatable integration is worth the development work, not simply because an API model name resembles a consumer editor.

14. Nuno Mimic: order a finished short clip

Nuno Mimic suits someone who wants to order a finished short clip rather than operate a generation workspace. Upload a 4–30-second clip and clear character photos, choose the offered quality and review the price before paying. Give the service a specific delivery note: who changes, which person in the source they replace and which action must survive.

Its current page offers one-off orders as well as optional subscriptions, so choose by the number of finished clips you need. For frame-specific revisions or repeated experiments, a self-service editor gives you more direct iteration. Check likeness, props and the requested movement in the delivered file before fitting it into your edit. Use your own or authorized source clip; a clip appearing in a service's library does not settle your permission to use every person, performance or soundtrack in it.

A practical workflow for replacing a character

Write down what must survive before you render: the action, its timing, the camera move, the environment and any contact with objects or other people. Then choose the source-edit, performance-transfer or CG route that can address those requirements. The following sequence works as a preparation and review method across the tools; the actual controls depend on the chosen mode.

1. Prepare a source and reference that describe the same shot

Choose the shortest continuous shot that contains the complete action. Keep the performer visible, with enough space around moving hands and feet. A cut halfway through a turn creates a different problem from one continuous turn; split the shots when the selected workflow expects continuous motion.

Match the character reference to the source framing. For a waist-up performance, an equally readable waist-up design is more useful than a distant full-body figure. Include the costume and props that will appear, plus relevant face angles when the person turns. A reference that only shows the front cannot fully describe an unseen backpack or a complicated back-of-head design.

If the scene must remain close, prepare a replacement image from an actual source frame where the workflow supports it. Keep the original scale, stance and lighting while changing the identity. If you can reshoot the driving performance, use a clear background, steady framing and the real prop for the interaction; our guide to filming character motion references explains that preparation in more detail.

Use a performer, character reference and soundtrack you own or have permission to adapt. Obtain permission for a real person's likeness and performance before turning it into someone else's character.

2. Name the target, replacement and protected surroundings

A useful instruction identifies a visible source person, the replacement reference and the elements to retain. Avoid “replace him” when two people share the frame.

For a source edit, try this structure in the chosen tool's own reference notation:

Replace the person in the red jacket at the left counter with the character in the reference image. Follow the original reach, cup pickup and head turn. Retain the counter, cup, other person and camera movement.

Compare the result with those priorities, especially the cup pickup and the other person. If the new character has a much shorter arm, you may need to adjust its proportions, change the pose or finish the contact in a compositor.

For multiple people, write one mapping per person and keep reference order consistent. Describe position as well as clothing, since clothing is what you may be replacing. Keep the first version focused on identity. A simultaneous new location, camera move and costume makes it harder to see which change caused the motion to drift.

3. Preview the hardest moment before rendering the whole clip

Use the tool's still preview or keyframe controls where available. Pick a revealing moment: a side view, a hand crossing the face or the instant a character meets a prop. Check the identity and body shape there, rather than approving only the easiest front-facing frame.

Render a short complete action at a suitable preview quality. Change one variable at a time: reference angle, target mapping, appearance strength or structural restraint. Save the source and the version you are comparing so a visually attractive result does not accidentally replace a better-timed one.

For a series, settle the character design before generating every shot. Fixing a costume after ten different performances means reviewing ten more outputs. A clear reference set and one accepted gesture give you a more useful starting point than a long clip full of unresolved changes.

4. Check the whole performance, including the surrounding shot

Play the source and result at normal speed, then inspect the difficult moments more closely. Ask whether the hand arrives at the same object, the feet remain grounded and the head turn happens where the edit needs it. Review the beginning and end as well as the center; a new opening pose or shortened action can break a cut even when the main gesture looks good.

Check identity through profile views and reappearance after occlusion. Look at costume details, props, shadows and reflections. Then inspect the surrounding scene: does the door move, does the bicycle change shape, or does the other actor's hand merge with the replacement?

A successful first frame cannot answer those questions. If the camera path and background must remain frame-locked, plan for tracking, masking and compositing rather than relying only on another generative rerun. When the intended change is a prop or another object, our video object-replacement guide covers that narrower edit.

5. Finish the voice and export for the actual destination

Choose deliberately whether the replacement should keep the original performer's voice. Retaining source audio can preserve the original delivery, but changing a visible identity does not automatically create a new voice or new dialogue. If you replace speech, review synchronization as a separate step; our AI lip-sync tools guide addresses that task.

Keep a master at the frame rate and aspect ratio needed for your edit. Check duration, resolution, visible watermarks and the selected plan's export conditions before building the final sequence. Crop a copy for the destination rather than removing hands or a prop from the only master. For realistic altered footage, apply the disclosure required by the destination and intended use.

Common problems and the next useful repair

Repair the visible cause instead of adding more adjectives to the same prompt. These checks help separate an input problem from a mismatch between the workflow and the required result.

Questions to settle before choosing a tool

Choose around the part of the edit that would be hardest to repair manually. A fun new gesture, a performance with precise dialogue and a frame-locked commercial shot need different levels of control.

Can AI keep the exact same movements?

It can follow recognizable movement, but exact choreography and object contact need comparison with the source. Source editing targets continuity; motion transfer reconstructs a performance on another design. For a tightly timed handoff, foot plant or match cut, use the source as a reference during review and allow for tracking or compositing where the generated version deviates.

Can I replace two or more people in the same shot?

Use a mode that explicitly supports multiple identities or a workflow that processes subjects separately. Give each replacement a clear source position and reference. Test a crossing, touch or shared prop before committing the whole shot. A tool that automatically chooses the largest person is making a single-subject selection, not assigning every person independently.

Can I do this without a subscription?

Compare the cost of an accepted finished clip and its revisions. Free access can help you prepare references or explore a compatible tool, while the replacement mode, useful export or commercial permission may require different access. A one-off finished-file order can suit an occasional clip; a self-service plan can make sense for repeated iterations. Check the actual render and delivery requirements before buying either.

How long should the source video be?

Use the shortest segment that contains the complete action and fits the selected model and host. Keep enough opening and closing material to cut the result into your edit. For a longer sequence, split at natural shot boundaries, reuse the character references and review continuity between outputs. A long input allowance is not a reason to combine several difficult interactions into the first attempt.

Is face swap enough for a character replacement?

Face swap can be sufficient when the body, hair, costume and action should stay. A full character replacement also changes silhouette and contact, so it needs a more descriptive reference and closer movement review. If only the mouth needs to match new dialogue, use a lip-sync workflow instead of rebuilding the whole person.

Start with one character and one clear action

Develop a clear character reference in Dreamina, choose a readable action and decide whether the original scene must remain. For a new mascot performance, assign appearance and motion references deliberately. For an existing shot, choose the compatible local-editing mode and state exactly who changes and what must survive. Review one complete action before expanding to a longer sequence: that gives you a useful character replacement to build on, with the right motion for the intended edit.