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)
Sonic the Hedgehog
Megaman X (with all X3 enhancements)
The Human Torch
Fei Fong Wong
The characters are inserted shortly after Green Arrow was recruited.