KidPix, Jet Set Radio Future, Halo CE, Splashdown, and some Disney Princess game on the PC back in the late 90's.
I was the prettiest damn princess and made the best outfits.
Legend of Zelda for solo and decent 2/unreal tournament for competitive. Hard to say which defined me, but those 3 were definitely my games back in the day.
FFX for me. That game was the first in the series released when I was old enough to care. It was the first story driven game I ever played, and I know a lot of fans that had been with the series longer didn't like it but it was the game that opened me up to RPGs other than Pokemon. FFX will always have a place in my heart despite that ungodly awkward laughing scene in Luca.