Sion Bladan is the legendary hero who first sealed the Demon King and his forces at Hell's Gate. When the Demon King threatened to return, Sion came back to confront his sworn enemy. He met his end after falling into a pit trap dug by a farmer, Touka Scott, who was trying to defend himself from demons. This accident compelled the necromancer Anri Haysworth to extract Touka’s soul and place it into Sion’s reanimated body to impersonate the hero.

It was later uncovered that Sion’s death was not wholly accidental, but a suicide borne from profound trauma accumulated during his journey—a result of the severe hardships and sacrifices he endured. He had also committed a grave crime by sealing the Gates of Hell incompletely, an act he performed to save his necromancer partner, Anri, who belonged to a clan descended from humans trapped in the Demon world.

Sion is a powerful sorcerer possessing immense magical ability and a firm sense of justice. A charismatic and confident leader, he earned deep respect from his comrades for his strategic mind and command within the hero’s party. His unwavering dedication to his mission and fierce loyalty to his friends solidified his heroic stature. Though brave and fearless, he also showed compassion and empathy, regularly risking himself to protect others.

His personality reflects the ISTJ type: responsible, diligent, detail-oriented, and practical. He approaches problems in an organized, methodical manner, favoring reliability over risk. A strong sense of duty and loyalty defines him, alongside a reserved nature and a preference for solitude. His Enneagram type, 8w9, blends assertiveness, strength, and decisiveness with a more easygoing and accommodating demeanor. This equilibrium makes him a formidable yet approachable leader capable of forging strong relationships and negotiating effectively.