I didn't ask if it was okay, though (I'd assumed it was since you said any class published by WotC was allowed) -- I asked how I should determine stats for thralls.  (Should I give them the standard 18, 18, 16, 16, 14, 14 array like for a PC, or should they have lower stats than that?  Should they have equipment, or would their equipment come out of my 200,000 gp?  And also, can they have LA or are they also restricted to being standard-race characters?)