Well, I am leaning towards Wizard atm.
You have:
Skeleton to post for guarding places you aren't.
Unlimited DD spells (as the kobolds can use them too).
Decent DPS and defense
Haste & Expedious Retreat
Negative Aura for healing
Possible SLAs from Archamage
CC for protecting Kobolds picking up Colossal Crystal
Knock for Rushmore
Thanks