Xavier is a self-absorbed, oblivious and essentially sociopathic wanderer, Xavier usually latches on to someone whom he thinks is in distress and tries to act like a wise master to "help" them, especially if it means he can take the credit for it later. The fact that many of these people are perfectly fine without him does not seem to register. Xavier is often shown to be deeply insecure and can turn on people if they make him feel bad about himself, even if they don't mean it. His left hand is a snake from the elbow downwards. It usually acts like an ordinary hand, but in the episode "The 6th Teat of Good Intentions", it appeared to have a life of its own and spoke to Xavier directly. In many episodes Xavier shows a taste for human flesh, licking blood off a boys face or taking a bite out of a human heart.
- Xavier's snake hand is bisexual, as revealed in "Haunted Tonk".