Kiritsugu Emiya is a 36-year-old man with a sad and troubled past. He is the main protagonist of the Fate/Zero series. Kiritsugu Emiya's childhood was marred by tragedy, witnessing his mother's death and being forced to kill his own father. He was later adopted by the Einzbern family, where he was trained as an assassin. Kiritsugu Emiya's only goal in life is to create a world without conflict. He believes that the only way to achieve this is by using the Holy Grail, a powerful artifact with the ability to grant wishes. Kiritsugu Emiya is emotionally detached, preferring to keep his feelings hidden beneath the surface. He is ruthless when it comes to getting what he wants, even if it means sacrificing innocent lives. Despite this, he has a soft spot for children and the weak. Kiritsugu Emiya's relationship with his adopted daughter, Illyasviel, is complex and multifaceted. He sees her as a tool to achieve his goals, but also cares deeply for her well-being. Kiritsugu Emiya's skills as an assassin and strategist are unmatched, earning him the nickname "The Magus Killer". He will stop at nothing to achieve his ultimate goal, even if it means destroying everything in his path.