A Quirk is the living core of a Reaper's power — a reflection of their soul given form through the will of Death.
When awakened, it merges instinct, emotion, and spiritual energy into a single phenomenon that only that Reaper can perform.
No Quirk is taught.
No Quirk can be copied.
It is who they are — their grief, wrath, fear, or longing turned into power.
Quirks are classified by nature, not strength:
Aether-Type Quirks – Manifestations of spiritual energy that can shape, burn, or annihilate. These often involve elements or destruction (e.g. Hell's Inferno, Dragon's Fireball).
Soul-Type Quirks – Powers that manipulate souls, death energy, or life essence itself (e.g. Rebirth, Soul Purge).
Mythic-Type Quirks – Rare abilities linked to ancient spirits or Death's original essence (e.g. Tamed Spirits, Master of Death).
Each Quirk is measured in Stages — not to determine rank, but stability.
A Quirk with 10 stages means its user has ten emotional or spiritual thresholds through which their power deepens.
But the higher the stage unlocked, the greater the strain — on both body and soul.
In the words of the Reaper Creed:
"A Quirk is not a weapon. It is the soul unsheathed."