Each of my characters have similar backstories and relatively the same personalities just worded differently with some differences between them. However the events in their lives and their experiences would, if they were locked in the room together, would cause them to hate each other or piss each other off to some extreme or another. The nature dweller wouldn't get along with the career soldier, the mercenary wouldn't get along with the angsty boy, the normal school boy would get along with the werewolf boy if they didn't get to into things. the female sekirei would find most of them annoying, and it would generally be a nut house.