The absolute worst part of temporary companions...

captainwolfos

...is when they call for a guard when you steal something in their presence. Even worse when they're not exactly on the straight and narrow themselves.

Here's looking at you, Valentyn.

Dishonourable mention to Naryu, too, even though I don't think she actually becomes a temporary companion. You're a career assassin, you have no right to judge my sticky fingers.