His Lore is split among the entries of his pieces. Read Up about em all!
Occasionally, if things get too overwhelming/the Professor starts feeling a certain way, A Hormonal Personality Overload may occur, leading to Other Personalities randomly getting words in through the Professor. The best solution to the Problem, is to talk to the Professor, discuss things while keeping him calm. Eventually, he’ll completely calm down, and his Personalities will Restabilize, though he might get stuck as one of them for a little while.