Ask an Aran thread.

Aran's have a low base hp, we all can agree on that, so how does an Aran Pap or zakum? Zakum is a peach when it comes to stunning thus destroying the combo, I read on basil somewhere that aran's stand on the body so they don't lose their combo. Does that mean Aran can't boss efficiently until the very late levels?

From what I've heard, they get around 47 HP per level, so you could easily have around 6.5k by 130. Hell, get HB and you can already "hump" Zakum's 3rd body. The most important thing about party boss runs is connections, anyways. You're not going to be denied from a ZRun because you can't "hump" Zakum's 3rd body.
Also, lolpap sucks for any melee class, but it's really easy to take the touch damage.