N64: Mario. Pretty balanced guy, not hard to use. Not many other choices here since there weren't too many characters.
Melee: Roy. He's Marth, but I actually played his GBA Game, so I used him instead.
Brawl: Marth, solely for his awesome counter attack. Actually, all his special moves are pretty useful.

Link, all 3 games.
I enjoy slicing my opponents down bit by bit.

N64: Link
Melee: Roy
Brawl: Ike

N64: Samus
Melee: Marth
Brawl: I'll use pretty much any character, but my best is probably Marth

N64: Kirby
Melee: Young Link
Brawl: Luigi (when I really want to win tho, I use Pit because he's so goddamn broken)

Pit, Lucario (hes a boss), and link
mainly lucario though

Hey if anyone still has brawl, friend code?

I only play Melee, but my favorite characters are Mr. Game & Watch, Pikachu, Link, Fox, Ness, Kirby, Samus, and Mario.

I LOVE BRAWL IM A BEAST! im awesome with my all-star team of Starfox, Pit, Kirby, Lucario, and Mr.Game and Watch

Quote from Hewitt

Meta-Knight, Pikachu, Toon Link, and Ice Climbers

Peach, Marth, and Young Link in Melee

Link in Orig.

Toon Link is pretty badass.

Go, Nes is da best

i got 1 for each game
N64:Link
Melee:Luigi
Brawl:Ike