[@Dynamo Frokane] No, I don't mind. I've never played Killer7 before so I won't be able to get a clear picture but I can still help with what I can. 

As for The other two, what sort of personality type are you looking for exactly? 

Since you have "The Creative One, The Romantic One and The Active One" how about "The Chaotic or Destructive One". It seems to go hand in hand really. Mm, as for the other... Not sure...