Guilty Gear
Zappa is my absolute favorite, no contest. I love his design, his backstory, his unpredictable fighting style, the painful and creepy way he moves, his random shrieking and babbling...absolutely everything about him.
Slayer. His dash is a teleport, which is incredibly useful, and he's got a nice solid brawling style that's really fun to use. He also gets bonus points for just being stylish. His victory pose where he snaps his fingers is too cool for words.
Anji Mito. Mostly I just love his character design. I've got a thing for bare backs...what can I say, he's sexy. <3
Tekken
Devil. I was the first person in my group of friends to figure out his eye-laser move, and proceeded to use it to cheese the crap out of anyone who dared to challenge me.
Bloody Roar
Shina. Her fighting style is a really nice combination of flair and brutality, which I find really satisfying. She's not as pure "bash your face in" as Gado, but not as complicated as Long.
Alice. She's adorable, fun to use (though I'm better with Shina), and I have to love any character with my name.
Fox. Gotta love the psycho bishes! Plus I think he's way more fun to use than his replacement in the later games, Jenny.
Soul Blade/Soul Calibur
Raphael. CHEEEEEESE. XD The first time I played Soul Calibur II in an arcade, I picked Raphael and was able to beat the entire story mode with like, three moves. Also, I haven't played SCIII much, but I'm fascinated by the direction his storyline has taken.
Mitsurugi. Again, nice solid fighting style, useful in all situations.
Evil Zone
Linedwell Rainrix. He's creepy as hell, and he likes to carve inverted pentagrams in things and stab himself with his demon sword. You may have noticed I gravitate towards the creepy dudes. XD Also, if anybody other than me has played this game, you are officially awesome.