Well that's dumb. Why would anyone call a girl Leo? And why does she sound like a dude? Ugh, oh well.
Well, in SSFIV I play mostly Juri, Ibuki, Cody, and Chun-Li, with the occasional Guy, Makoto, Rose, and Cammy (the order I presebted these in doesn't matter in anyway just to be clear). But I like to use other characters too, like Zangief and T. Hawk, so I go random sometimes.
In Tekken 6 (the Tekken I can seriously play), my main is Alisa and she's the only one I'm actually good with. I use Lars, Lili, and Steve from time to time too, while I've been trying to learn Christie, Leo, Asuka, and Ling.