Interesting party you've got there. I myself decided to go only for 4 characters (you earn 1/3 more xp that way for each kill). Two warriors up front (elf and human) a whiskas priest and a pixie wizard. Made the warriors barabarians early on in the game so I got the lock-pick skill. But to be honest I had a thief with me until my barbarians got good enough to open trapped chests.
Good luck on your questing!
//Jazzid
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