Monji Gatou

Gatou Monji is the Master of Berserker Arcueid in Fate/Extra. Gatou is a guy that has mixed several religions, and worships his Servant as a god. His objective is to save humanity via his self-made religion.

Role
As a Master Gatou is largely incompetent, severly restricting his Servants abilities that had already been restricted by being summoned as a Berserker class. All of her abilities as a Berserker are downgraded from A rank to C rank simply due to his "incompetence as a Master," with the exception of her EX ability which simply gets rendered useless. Also, anyone who is familar with Tsukihime will know that she is already restricting the majority of her powers to begin with. His incompetence was probably incorporated to make it believable that the player can fight toe-to-toe with one of the most powerful beings in the Nasuverse. He is exclusive to the Rani route if the player pickes her to save during the crisis following the defeat of caster in the 3rd week.