Balthromaw is depicted to be rather grumpy, and doesn't seem to be happy with his position as a pet dragon. However, he does become friendlier if meeting or bonded to rider that treats him like an equal or shares a similar point of view on the world.

Balthromaw is also sexual and promiscuous as he "soul-bonds" with many people. Although soul-bounding is limited to 1 person according to a dragon's contract, he doesn't feel bound to comply. He asks people for sexual favours when released onto Ear