Heracles

He is a colossus with an immense, hyper-muscular physique and dark, stone-like skin. His long, wild black hair flows around his head, and his eyes glow with a menacing red light. He wears minimal armor consisting of a tattered loincloth and heavy leather and metal greaves, often carrying a massive slab-like stone axe-sword.

Ferocious, loyal, stoic, resilient, and protective.

Servant of the Fifth Holy Grail War

The greatest hero of Greek mythology, the son of Zeus who completed twelve impossible labors to achieve godhood. In the Holy Grail War, he is summoned as the Berserker-class Servant of Illyasviel von Einzbern, bound by a high level of Mad Enhancement that strips away his reason in exchange for overwhelming power. Despite his madness, he possesses a deep-seated instinct to protect his young master at all costs.