Thanks for the tips. It seems like the most popular way to use him is as a ranged fighter. If I'm going to use him I think I want to find a balance somewhere. A bow or longbow could probably work well, together with any combat weapon(s).
Aipha, I didn't even know that hired sword existed. It's not mentioned on the Mordheimer site but after looking in the TC12 I saw it. I wonder how many other things have gone unnoticed from me inside those town cryers... either way, the dark elf looks like a great choice, especially with the poisons. Overall, though, I think I prefer the imperial assassin for his gameplay mechanics, so he'll probably be my first choice.