The Servant of Illyasviel von Einzbern. Berserker is powerful and foolish, yet well-meaning. Under Illya's control, she frequently uses him for menial tasks like shopping for batteries. He has a fondness for Lancer (which Lancer does not return), often chasing after him and lugging him around, and even using him as a weapon. He is capable of transforming into a tank-like vehicle, dubbed "Berser-Car".