Just for this thread, lets assume that all of these characters actually exist in the animated DCU regardless of how it defies logic. So, what if the JLU tried to recruit these characters? Could they be convinced? And assuming that they were somehow coerced into joining, how would they fit in (and we'll assume that all other obligations and relationships magically disappear, since the leaguers don't seem to have much life outside of the league)? Feel free to add characters:

Ranma Saotome (Any attempts by league magic users to cure his curse result in the usual comedic disappointments)
Peter Parker
Ness
Mihoshi
Sonic the Hedgehog
Megaman
Megaman X (with all X3 enhancements)
Mr. Fantastic
The Thing
Sue Storm
The Human Torch
Wolverine
Fei Fong Wong
Rogue

The characters are inserted shortly after Green Arrow was recruited.