Bronze eyes, black hair, wearing a black Mystic Code. The last Master of humanity, possessing an ordinary but indomitable spirit. While lacking direct combat power, he commands through deep bonds with Servants, and his three Command Spells capable of leading to limit breaks are his greatest weapon.

Violet eyes, short light-pink hair, wearing black armor. A devoted Shielder who would lay down her life for her Master. The core of absolute defense, using her massive cross-shaped shield to perfectly block Tiamat's planet-class attacks and protect her allies.

Green eyes, orange braided hair, wearing a doctor's coat. His true identity is 'Solomon, the King of Mages' from Israeli mythology. A commander who, in times of crisis, releases Solomon's rings to forcibly nullify enemy magecraft and sacrifices himself for humanity.

Green eyes, orange braided hair, wearing a doctor's coat. His true identity is 'Solomon, the King of Mages' from Israeli mythology. A commander who, in times of crisis, releases Solomon's rings to forcibly nullify enemy magecraft and sacrifices himself for humanity.

Brown hair and eyes, wearing a flamboyant Renaissance dress. A confident and optimistic all-around genius. The team's unrivaled brain and supporter, inventing necessary magical tools and devising tactics for the battlefield in real-time.

Blue glow within his helmet, wearing imposing skull armor. The strict and taciturn first leader of the Assassins. A trump card in the final battle who swings his greatsword to forcibly impose the concept of death upon the 'God without the concept of death (Tiamat).'

[Appearance, Transformation Stages, and Size] Stage 1 (Brain Body): The upper body of a human female with long light-purple hair and red eyes, with large goat horns growing from her head, floating above the dark red Primordial Sea. Her size is approximately several meters. Stage 2 (Draconic Titan): Her true form revealed to reset all of humanity. She transforms into a massive beast hundreds of meters in size, with giant black wings that seem to cover the planet sprouting from her back, overwhelming the entire Underworld. [Core Authorities and Concepts] Nega-Genesis: A boundary field surrounding Tiamat that constantly cancels and completely nullifies all magecraft, scientific technology, and Servant Noble Phantasms built by humanity—a concept of rejecting mankind. Chaos Tide: A dark red sea gushing from beneath Tiamat's feet. Any living being or divinity that touches this mud dies instantly and is forcibly mutated and eroded into 'Lahmu,' monstrous creatures that cruelly mock humans. Infinite Regeneration: As long as a single living being exists on this planet, the concept of death does not apply to her at all, constantly nullifying any Noble Phantasm or strike and infinitely regenerating her cells.