I suppose you could set the AI up to "type" but if we are going to go this melting pot route, then the Mos Eisley "creature" cantina model is a good one to follow.
Besides, MOST, of the NPC's of the Drain that actually have a Name (Nym for example), are so heinously Overpowered, Out of Balance, and Obscene that you wouldn't want them interfering in an altercation anyway. Bear in mind the Over the top nature of most of the NPC's of POTM, is even more exaggerated in the Drain.
~Rex