A paladin would never dare ally himself with a demon loving mage.

our one was not quite a demon mage and a paladin, but both were opposed to each other and there were quite a few attempts to kill one another. The rest of the party needed both of them, so had to stop them from killing each other or sabotaging their actions.

I was once That Guy. It was my first Wizard I'd ever rolled, and I specialized in wrecking ass with Burning Hands (this is 4E, where Burning Hands is actually pretty damn strong), so I got a little nuts, and hit the warforged Slayer who was our impromptu tank because he was so beefy, with just about every Burning Hands, every fight.

He got upset.

So, being a pal, I re-rolled as an actual tank, the Knight, and we ruled the frontlines of every combat like total bros. The enemies couldn't escape my aura of aggro without me kicking the shit out of them with attacks of opportunity, so he just flanked them and wailed away with a greatclub.