Sure, I'll take a crack at it. Most of these are probably better suited as event matches though.
Bowser vs. Ganondorf (if confirmed) - who's more evil?
Snake vs. Sonic - no,
I was gonna be in Melee first!
Pit vs. Wario - My melee trophy is better than yours!
Bowser vs. Donkey Kong vs. King Dedede vs. Ike - Battle of the heavy-weights
Snake vs. Shiek (if confirmed) - Who's more ninja?
Pit vs. Metaknight - Just because I think it'd be cool
Link + Zelda vs. Ganondorf - Triforce match!
Kirby vs. Metaknight vs. King Dedede - Sakurai-Brawl!
Snake vs. Shiek (maybe) - Find out Shiek's TRUE gender!
Snake vs. ZSS - "Mei Ling, Samus took her clothes off!"
Mario (Doctor) vs. Wario - Wario's got gas! Help Mario cure him!
Captain Falcon (???) vs. Sonic - That little rodent stole your title! Knee bash his face to get it back!
King Dedede vs. Wario - Who's lazier? (on second thought, how are you supposed to tell?)
Ike vs. Ganondorf (with sword) - Whose sword is bigger? Compensate much?
Pit vs. Ganondorf - Defeat the king of evil!
Wario vs. Kirby vs. Yoshi - Get in mah belly!
Donkey Kong vs. Bowser - fight for the princess!
Fox vs. Pokemon Trainer - PT thinks Fox is some kind of new pokemon! Beat him before he stuffs you in a tiny, air-tight pokeball!
Link vs. Zelda (alt costume) + Peach (alt costume) + Zero Suit Samus (alt costume) - The rabid fangirls are attacking! Fight them off before their high-pitched squeals render you senseless!
King Dedede vs. Ice Climbers - *insert highly overused lyric quote*
Pikachu vs. Sonic - battle of the rodents! He may be faster than sound, but is he faster than lightening?
Sonic vs. Captain Falcon (maybe?) - Beat Captain Falcon in the Grand Prix... on foot!
Kirby vs. Sonic - Sonic-Kirby!
Shiek (maybe) vs. Wario - Dance off!
... Yeah, definitely more like event matches. Oh well, some of them are pretty funny.
Captain Falcon vs. Snake- Do I even have to say it?
That's gotta be the best one
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