Also known as: 言峰士郎
An Alternate Universe version of Emiya Shirou, if Kotomine Kirei were the one to raise him.
Basically has the same appearance as Emiya Shirou, but wearing a dark church-themed outfit, often seen with Cross Necklace or wielding Black Keys (Type-Moon).
Kotomine Shirou is a fan creation who appears in Fate/Protoreplica.
Not to be confused with the Kotomine Shirou from Fate/Apocrypha.