Import or record the Roblox footage you want to trace
Open Blender and switch to the Video Editing or Compositing workspace
Add the footage to the timeline or background image
Set the frame rate to match the original video
Create a new Grease Pencil object
Enable onion skinning for frame-by-frame tracing
Lock the footage layer so it does not move
Trace the Roblox character or object frame by frame with Grease Pencil
Use keyframes to adjust the drawing on each frame
Keep linework simple and match the original silhouette
Hide the footage layer when checking the clean rotoscope
Refine the outline by editing Grease Pencil strokes
Add fill colors if needed
Render the animation with the desired output settings
Export the final rotoscoped animation as video or image sequence