Dont worry too much about Mahvel, it was very casual play, not any of that ridiculous **** on actual tourneys!
SF4 series took me a while to find my main, but i ended up maining Dan and not doing too badly! I participated in "The New Challengers" tourney at BAM last year under the name Stacey (as a joke!) and Playing a very safe Yun (because all i knew from him was like, that palm Target Combo , and he had pretty good pokes) And Dan when my Yun failed pretty much outright. I managed to Tie for 8th place.
But yeah, I mained Dan.
At the moment, I'm generally Maining Roy and Snake for PM,
For melee it's still largely undecided but i had a small list of chars who look fun and interesting
in no particular Order
1.Captain Falcon (just cuz principle, everyone loves falcon)
2.Luigi
3. Mewtwo
4. Ice Climbers
5. Pikachu
But i am open to suggestions also!