Kabuki-Kun

Boku no Hero Academia oc

 her face is interchangeable like a mask and can be replaced with life-like "replicas", making her great for impersonating enemies, gaining intel, etc. These "masks" are usually made by her and allow her to change her voice, hair, mannerisms, etc but not her gender or her height. Her family originally wanted her to continue their long line of Kabuki actors but she wanted to become a hero like her idols.

Her mask disguises are incredibly lifelike, mostly indistinguishable from the real thing. Her own 'mask' however is completely static, the only moving component being her eyes. Otherwise her expression is always frozen in that patient smile, and she speaks without moving her lips, as if from behind a mask.