My main is Meta Knight, though I still need practice with him. Other characters I'm learning to use are Ike, Marth, Dedede and Diddy Kong. I once used Kirby, Z.S.Samus, Sonic and Pit, but I've seemed to have lost touch with them.
In SSBB-related news (not sure if this can be posted), I cleared Very Hard Boss Battles with Meta Knight. Two surprising things IMO: 1. Tabuu's Off Waves don't quite one-shot KO you, but get very close. 2. I'm losing form against 'easy' bosses like Rayquaza and Porky, even with Meta Knight.