Love the game! Though, I think I found a major bug in New Game+. (MAJOR SPOILERS FOR THE FINAL ZONE IN NEW GAME+)
For some reason rather than having his own skills like the rocktitan says, Mr. O has the abilities of the rest of the characters instead. This makes the arena section far harder (maybe impossible? idk I might just be bad) as you lack Reload, meaning you're stuck with 40 MP for each arena. I'm unsure how this bug was triggered sadly...