Mike

Mike is a mage from Fate/stay night:  Chilling Winter, and is one of the five guards guarding Tohsaka Mansion in the beginning of the story. He and Joe have known Shirou since he and Rin Tohsaka were very young. All five of the guards are killed by a mysterious mage, later revealed to be Kirei Kotomine, from the shadows, so Shirou can be attacked.