Each hireling comes with a brief bio that sometimes lets you know what you will end up with ahead of time. But wouldn't it be cool if they also came with a little blurb about how they REALLY are deep down inside?
Something like this:
Laerathor: I'm moody, surly, and I know it
Wyoh: Why-oh, why-oh, why-oh am I dead even though I still have 1400+ spell points left?
Hesha the Stern: I could really do some damage in this fight, if only I could run fast enough to reach it.
Herta: Get out of my way so that I can hit something.
Sadiele: I'm a butterfly! Hit something here, run 50 paces over there, hit something else...
Tanya Brightstone: Must...consume...spell points!
Larafay Do'rret: Boom-shakalaka-BOOM! Nuff 'said
Caraneth Myar: Convinced she speaks in a Beavis & Butthead voice "Fire, heh-heh, heh-heh, heh-heh"
Andaro: Let me see, 15 of them, all CR34 or better...yeah, I can take them!