OH BOY. i don't really go with it as "crushes". it's a weird mix of wanting to be them (a protagonist, usually) and also thinking they look cool uvu;;
i think my first was Squall from Final Fantasy VIII. that game was the shit to me in my early teens. he was my first "avatar" to use to daydream plots with (usually shippy stuff with Rinoa). I'm pretty sure he's the reason i love leather jackets, fur rims and belts.
and then it was Edward Elric from Fullmetal Alchemist. it was the 2003 anime. the episode before the last, i think, was the first thing that really shocked me. it was great. just seeing that imagery messed me up.
these days i have a long-ass list of various protagonists i adore to a ridiculous degree.