Occupation: Scientist/Doctor (he specializes in so many fields that he could probably qualify as both)
His knowledge and experience as a scientist in many fields makes him a valuable asset, but he's got a streak of madness that makes most people hesitant to utilize him. He's built specialized and custom weapons, fixed wounds, researched and identified new unknown objects, done plenty of experiments on various creatures, and much more.
He's mostly joking and layed back around people. He loves pushing their buttons and finding what makes them tick. More than a little full of himself, but he does know when pride turns to arrogance and when to cool it down. Probably really needs to express himself and put more trust in people, but he'd much rather disect a monster. He is overall pretty detached from others and is rather blunt when socializing.
He's done many experiments on his body, replacing or improving parts as he needs or wants. This is where his stitches and scars come from, which cover his whole body. He also has a large scar down across his back and one on the back of his head that is not from his experiments.
He isn't really one for relying on others, and usually looks for ways to work better on his own than as a group. He will, however, offer his assistance if the end goal is something he finds interesting or worth the effort. Or if the people looking for his help will owe him a favor in return. Either way he doesn't take most things seriously (aside from his work), and will generally just do his own thing so he stays entertained.
Basically he's a mad scientist hermit with little to no self preservation instincts and a nack for driving people crazy. He doesn't know how to deal with affection. Literally doesn't understand it. If you somehow manage to get him blushing, it'll be green and yellow to match his eyes.