Blasto could have a bunch of one-liners where he just makes fun of the other fighters for not being as awesome as he is.
Definitely Fat Princess.
I already know I'll be trolling my friends by picking Toro, since they have no idea who he is and that'll cause them to rage. : D Also, wasn't the troll character in MvC3 MODOK? Deadpool's actually got a pretty big fanbase, and in the last few years especially he's really grown in popularity.
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