Cross Edge was the PS3 title, but there was also a PS2 title that was the spiritual prequel to the Cross Edge. I think it was called Chaos Wars? I know I might be messing up the title, but it was another game that was a crossover game for Atlus and other.

If that's the case, as far as characters go, I think I could keep up with the references then.

Also, Sega Neptune? (googles)