When we encounter a digital character, we perceive the persona as a whole—through facial expression, voice, motion, and body language. If even one of these signals is misaligned, the illusion breaks. Believability doesn’t come from any single feature, but from how all perceptual cues come together into a coherent whole. Generating engaging digital avatars requires understanding which perceptual misalignments immediately draw attention and disrupt immersion, and evaluating characters with special focus on the cues that viewers notice first.