Slender is a fatherly figure to the creepypasta's he likes. For example, Sally. To others he is boss like and serious. Slender tries to act serious but his true nature is in fact gentle. Unless you make him angry. Rule is, don't mess with his family, or basically you're dead. (This contradicts another headcannon I had, but these are the two views I have on him or what his character could specify as)