Yeah. Considerably noteworthy people will play an integral or cameo role, but many others can be the names of things like monsters, towns and equipment I figure.
Though I see a lot of people saying "I'd have ____________ for an attack!", something like 75% of the population probably won't have "attacks". This isn't Chrono Cross; there'd be like 3 main characters and x guest characters.
Also James, yes - the Double HarmoniZe Shock thing would work because awp kind of flip-flops allegiances and James is doing his own thing in the story, so there's no reason they can't team up at some point.
also @ Agent, I have an idea of how AMANTHES THE INVINCIBLE is taken down, but it's spoilers.