A person, usually male, who is not as big of an asshole as a motherfucker is, but is pretty damned close. It is a step up from their previous status.
NO, he was no longer a motherfucker, but had not redeemed himself as much to be elevated above otherfucker.
Derived from the word humanitarian, it indicates one who is an enabler of fanfiction recommendation and propagation.
Her philanthropic ficsterian tendencies helped to spread the word of Twilight Fanfiction.