I have been playing ultimate alliance 2. How do u unlock characters?

I have been playing Marvel Ultimate Alliance 2 and idk how to unlock

characters?I have been playing ultimate alliance 2. How do u unlock characters?
To unlock most of them, you need to collect the character items. The best way to do this is play levels again on the simulator that says you're missing character artifacts. Then you go through the level very carefully searching under everything (Storm is good for blowing the things away, but any radial or wide spread attack will do) and going everywhere.



There are guides to the locations on several sites, but they're easy enough to find on your own, you only need 5 of each=P.