From Capcom's Power Stone, it's Rouge! There's bits of her design from the second game too (the heart-shaped braid clip and the dagger) just because. The character designs in Power Stone are pretty striking and memorable (I've drawn Ayame in the past) but Rouge in particular is a favourite... Although I actually mostly missed out on Power Stone back in the day outside of a little time with the second game. Playing the PSP collection on-stream was fun though!
