Odd request, but this should go in the questions thread at the top of the forum:
Off the top of my head:
Wolverine: Jinzin
Surfer: darthgoober
Thor: I'd say myself, but there's others equally as qualified. Scoobless for Avengers appearances.
GL: Val-E-Doosh (if you can get him to be serious)
Hulk: good luck. You'll either find apathy toward the green dude, or raging fanboy-ism that is overly bias. Not much middle ground.
The respect threads for all these characters are good for knowledge on them too.
Anyway, closed. Use the thread mentioned earlier, pinned at the top of this forum.