Merasmus, also known as Merasmus the Magician, is one of the three secondary antagonists (alongside Redmond Mann and Blutarch Mann) of the Team Fortress franchise, serving as the main antagonist of its annual Scream Fortress event and a major character in the comics.
He is the RED Soldier's former roommate-turned arch-nemesis, and keeper of the Bombinomicon, a magic talking book of spells.
He was voiced by Nolan North
https://villains.fandom.com/wiki/Merasmus