Sieg

Sieg (ジーク, Jīku) is the main protagonist of Fate/Apocrypha series, who acts as the second Master of Rider of Black during the Great Holy Grail War. He also appears in Fate/Grand Order's Apocrypha/Inheritance of Glory event as Caster (キャスター, Kyasutā), a Caster-class Servant summoned by Ritsuka Fujimaru.