Type? I'm thinking some sort of ENTx. ENFj would also be a good guess. At this stage I might even consider some sort of hyperthymic INFp syduck:
MS Paint Adventures, his site/webcomic universe is entirely self sufficient, paid for by his record label and various other online stores (such as t-shirt designs). His job is the webcomic.
The character he has the easiest time writing for, in terms of having stated having the most similar thought processes to, is an ISTx of some description (Dave Strider).