While these aren't official since I don't have access to a Wi-Fi compatible Wii until a few days from now, people should be aware that I am considering pursuing the following M3 titles [this is also sort of notes for myself]:
MK
Falco
Captain Falcon
Ice Climbers
Ivysaur
King Dedede
Kirby
Link
Lucario
Marth
Olimar
Pikachu
Pokémon Trainer
Sheik
Toon Link
Wolf
Zelda and Sheik
Zero Suit Samus
For the record, most of these are more because I want to play people good at the character than because I actually want the title - I fully expect to lose at least the Captain Falcon, ICs, King Dedede, Olimar, and Zelda and Sheik champion matchups (since those all have open slots, I'd challenge champion). I'm also not terribly optimistic about most of them besides the top 2 (the characters I played before I left), but I want an excuse to play a bunch of people when I get back.
So put me down for open RU spots in those categories for now (should be all but Link, Lucario [though those players were listed as "long inactive" I believe], Marth, and Zero Suit Samus) and I can start issuing challenges when I can actually access Wi-Fi.
And if one can't claim an open RU spot without Wi-Fi, then I claim them as of the 10th, so someone can claim those open spots beforehand and I'll duke it out with them too.