Oh yeah, I should probably try to be specific even though I don't know much about any of them.
Spider-Man - preferably a trade with Venom.
Iron Man - Outside of movies I know nothing about him so just something where he's really great would be fine.
X-Men - Preferably the uh main group people unfamiliar with it would still know like Wolverine, Storm, etc. Something with Jubilee might be nice too since I got the feeling the live action and animated stuff never really cared about her.
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http://myanimelist.net/animelist/swordz9