Juggernaut, also known as the Tyrant, is a character from the second season of the anime The Eminence in Shadow. He serves as one of the three monarchs who rule the Lawless City, holding dominion over the Black Tower. His reputation as a brutal and dominant force is reflected in his nickname and his governing style, which is based on fear and overwhelming strength rather than political maneuvering.

Physically, Juggernaut is a giant of a man with tanned skin, brown shoulder-length hair, and black eyes that are said to have a falcon-like glint. His appearance is further characterized by a facial scar, a beard, dreadlocks, and fingerless gloves, contributing to his intimidating presence. His personality is as savage as his looks suggest. He is bloodthirsty, insolent, and lives for the thrill of combat, willing to attack anyone who crosses his path regardless of whether they are an enemy. Juggernaut is a pure individualist who despises following orders and rejects cooperation, typically viewing any situation as an opportunity to start a fight. His approach to battle is driven by a sharp, almost animal-like intuition rather than formal strategy.

This instinctual nature defines Juggernaut's unique combat style, which sets him apart in a world of magic swordsmen. He rejects the use of refined techniques, believing them to be shackles that only slow a fighter down. While he wields a massive, billhook-shaped slab of iron, he does not use it like a traditional sword. Instead, he swings the giant blade to obscure his true movements, creating a distraction before closing in to strike with his bare fists. This unorthodox and dirty style of fighting, a mix of brute force and street brawling, has made him a notorious "magic swordsman killer," as most opponents trained in formal dueling are unable to counter his unpredictable attacks.

Juggernaut plays a significant role during the Red Moon Incident in the Lawless City. He is first seen rushing toward the Crimson Tower, the domain of the Blood Queen Elisabeth, and briefly confronts the protagonist Shadow and the fox spirit Yukime. Inside the tower, he attacks Claire Kagenou and the vampire hunter Mary, quickly overpowering them. His rampage is abruptly ended when Shadow intervenes with a powerful kick that sends Juggernaut flying out of the tower. He survives the fall and climbs back up in time to participate in the battle against the Blood Queen, Elisabeth. For the first time, he feels truly outmatched by an opponent's immense power, which leads to an unusual moment of cooperation as he fights alongside Beta, Yukime, and others against the queen.

Following the incident, Juggernaut returns to his domain in the Black Tower, reflecting on the strength of Shadow and his organization. His final fate is sealed during the conflict between the Mitsugoshi Company and the Great Trade Alliance. The shadow operative Delta discovers the true identity of the agent John Smith, which threatens to disrupt a larger plan. To keep Delta occupied, Shadow directs her to hunt Juggernaut. As a result, Juggernaut meets his end at Delta's hands, who later states that she has "caged" him. This fate underscores the brutal and transactional nature of his world, where even a powerful tyrant can become a mere piece in someone else's game. His ultimate fate is even played for dark humor, as a decapitated chibi version of his head appears in the staff credits of a comedic spin-off anime.