AI VTuber Guide

What is AI VTuber?#

Linked to AI Auto Answer, a Live2D character appears on screen and reacts with expressions, motions, and lip-sync whenever the AI responds. You get a character-driven live stream using only an OBS browser source — no dedicated rigging PC needed.

Choose the Auto Answer to Link#

• AI VTuber does not run standalone — it places a character on top of an existing Auto Answer widget.
• First create at least one Auto Answer slot at /auto-answer-studio.
• An AI VTuber is auto-created 1:1 with each Auto Answer. On the AI VTuber page, pick the one to configure from the widget selector dropdown.
• If you have multiple slots, link a different character per slot to operate them per channel.

Model Choice — Preset vs Custom ZIP/RAR#

• Pick a built-in character from the ‘Preset’ tab to start immediately.
• Under the ‘Custom’ tab you can upload a ZIP or RAR containing your Live2D Cubism exports (model3.json / moc3 etc.).
• The archive (ZIP/RAR) must contain exactly one model3.json, one moc3, and a textures folder.
• If the preview fails right after upload, check the ‘Upload status’ message to debug the file structure.

Position · Scale · Expression · Motion#

• Use the Offset X/Y values to shift the character horizontally and vertically (0 is the reference).
• Scale controls character size; ~0.3 is a natural starting point at 1920×1080.
• Use the expression/motion dropdowns to assign idle expressions and basic motions (wave, joy, surprise) the model provides.
• Lip-sync is synchronized automatically while AI answers are being delivered.

Issue URL & Register in OBS#

The VTuber widget URL is already created together with the Auto Answer. After configuring, copy it with the ‘Copy URL’ button.

Add a ‘Browser Source’ in OBS, paste the URL, and match width/height to your stream resolution.

Place it in the same OBS scene as the Auto Answer widget and put the character layer above the answer text for natural compositing.

A VTuber is removed when you delete its linked Auto Answer widget.

Use-case Ideas#

• Face-free livestream: With no webcam, an AI character takes your place — engaging viewers via expressions and lip-sync.
• Donor-only reactions: Trigger special motions/expressions for donations above a threshold.
• Collaboration live: Place different characters in multiple slots to host formats like an ‘AI character two-person talk show’.
• Event-style cameo: Keep it OFF normally and reveal the character at a specific moment for a ‘guest appearance’ effect.

When changes are not reflected in the URL#

Double-click the source with the URL in OBS, check the ‘Refresh browser when scene becomes active’ checkbox, and click the ‘Refresh cache of current page’ button.