Character from Invincible by Robert Kirkman
A young woman cursed to age backward every time she transforms into a monster — getting more powerful as her human body gets younger.
Amanda is trapped between two bodies — a monster form that makes her one of the strongest fighters on the team, and a human form that's slowly regressing to childhood. Every transformation costs her a few months of physical age. She's an adult woman who looks increasingly like a preteen, which isolates her socially and makes her relationship with Robot increasingly complicated. Her frustration at being underestimated due to her appearance is a constant undercurrent.
In human form, appears as a small girl (getting younger over time) with short dark hair and sharp, frustrated eyes that belong to someone much older than she looks. In monster form, transforms into a massive, hulking green creature with enormous strength — think Hulk but feminine and toothy.
Also known as: Monster Girl, Amanda