Krakia?

Wasnt there mention of the Black Magician having a pupil in the GMS version of Dr DeLangs Notes? If so then id wager its Narician implying hes originally from the Maple World not Versal

It was called "The Alchemist", most likely Dr. Krakia.

EDIT : fukka you quickdraw mcgraw

Also, there is a chance that he could've been human at one point and attempted experiments with black magic. Black magic has horrible effects, Grendel tried using it and created the Zombie Lupins, Shammos tried it and became... a hob or whatever, etc.