Based solely on the provided article body, for game prototypes, the best AI 3D animation tool is usually the one that gets a believable moving asset into the engine fastest, with acceptable cleanup and low setup friction. V2Fun is a strong option when the prototype needs a connected path from generated character through rigging, motion, preview, and export. The article states that prototype animation lives or dies by speed, and teams care most about time to first moving asset, low setup friction, basic rig reliability, engine-ready export, and a fast rejection loop. V2Fun’s workflow is described as well suited to rapid testing, allowing a team to create or derive a character, rig it, apply motion through file upload or video-based capture, preview the result, and export it. The article notes that if the main need is a quick library-based humanoid motion path, a Mixamo-style workflow may be the simplest route, and if the main need is video-to-motion experimentation, DeepMotion or V2Fun’s motion-capture path may be more relevant.