A mutant from birth, it rapidly became apparent that he was never going to receive the same opportunities as those who classed themselves as normal. In time, he learned to make his own.
Mischievous to a fault, he seems to almost completely lack empathy for those unlike himself. In the mutant world, he has shown himself to be naughty, though not actively malicious, though the same cannot be said for his activities around humans. Tired of being classed as different, substandard, he has no compassion for anybody that he classes as better off than he is: humans.
Possibly a kleptomaniac, though his desire to rampant theft could be a continuation of his want for balance between his own situation and the human condition; he classes them to be privileged over himself and seeks to even things up by stealing from them.
He is not chronically aggressive around humans, though those who are arrogant or scathing by nature should beware, as should those who choose to tell him what he can and cannot do, no matter the species. He is rarely hostile towards aggressors, but will torment them mercilessly; sometimes causing physical harm.
He is almost certainly a sociopath.
Profile of a sociopath: (edited from: http://www.mcafee.cc/Bin/sb.html)
Genetically suited towards teleportation:
This can be triggered manually over a limited distance, and it is possible for him to teleport inside locked buildings if he has at least some idea of the layout inside. It is unclear if he can teleport inside a wall or partially through an object by mistake.
Percussive force to his person or penetrating injury has been known to automatically trigger a teleport, though he never escapes completely unharmed from subconscious space-jump. If he has time to consciously initiate the move it is near-impossible to harm him unless the exact nature of his weakness is discovered.
It is possible to stop him, even when teleporting to avoid detection/attack, but the method of doing so requires trial and error. He knows his own weaknesses, but does not divulge them.
Generally difficult to determine, as any facts given by Max himself should be discounted as partial or often total untruth.
He spent some time with therapists and mental health specialists, and draws on their explanations and techniques in his own endeavours from time to time.
He has watched a great deal of medically-based television, documentaries on psychology, etc.
He spends a great deal of time people-watching.
He studied psychology, though his grade and learning method are unknown.
Most of his pastimes and past occupations have been for the sake of furthering his skills in emulation of emotion and normal social behaviour. He prides himself in his ability to appear normal and has extensively studied human emotional and psychosocial dynamics to make himself believable.