He may or may not be extremely unhinged due to a drunken bet that made him a wizards potion tester for a day. On the upside he makes a lot of money killing shit for weird people, on the downside he now has a ravenous hunger and is continuously building the list of things that will not satisfy it, which includes but is not limited to, elves, dryads, doors, money, and various creatures and objects, however in the last session i found that magical items might be the key since he felt a tingle eating a scroll of create water. I have a feeling the next mage i get my hands on will not be a happy camper.
A groupmate once described him as like a giant garbage disposal.
Personally i like having mental illness' in games, it adds a certain realism to it, despite my characters getting shafted most times.