The concept this time is to step away from the normal familiars (cats, rats, snakes, ravens, etc.) and dream up something new and interesting...If you know me at all you'll know I really dig axolotls. So a classy wizard would doubtlessly prefer an axolotl familiar over some other animal. In this case it's a dire floating axolotl, but an axolotl the same.
It would grant it's wizard master with water breathing and regenerative powers, so it would be a good companion for a wizard who preferred adventure in the elements over scholarly pursuits. Geek off!