The ideology of being a Hero of Justice (正義の味方, Seigi no Mikata?, lit. "Ally/Defender/Champion of Justice", "Superhero") is followed by various people who share this belief.
Differing from fighting for the sake of others (altruism) or oneself (glory) as a hero, those who hold the concept of being a hero of justice will fight for the concepts of benevolence, justice, loyalty, and love in which they believe.
- Kiritsugu Emiya
- Shirou Emiya
- Siegfried - Although he followed the staunch path of a hero until his death, he wished at the end of his life that he could have fought for his own wish, to be a hero of justice.
- Julian Ainsworth - Shirou calls him a "Champion of Justice" wishing to sacrifice one person for the greater good, while those opposing his ideals are technically setting out to save one person for the world.