Heh, I'm guilty of creating a maximum sized CAF but I haven't used him online as of yet. Actually, it's a bit of a tradition I have whenever I get a game where I can create a character in, dating all the way back to NBA Showtime back on the Sega Genesis.
I make him the maximum size available, skinny as a rail, left-handed if possible, and uses awkward styles. I have him using Boxing and Judo. Almost all of my CAF's have used Judo so far, I really like it as opposed to BJJ and Wrestling, it just allows you to get out of any bad situation in grappling.