Right now I have my character (Rogue) and 4 companion characters (Wizard, Priest, Fighter, and Chanter) all Level 4 doing the Temple right now on Hard difficulty.
I would love to hire a 6th character (a fighter that is a tank so I have 2 tanks) but I'm afraid that the hired character will steal experience from my other characters and I only plan on using him until I gain one more companion.