Stealer, a female entity with vibrant purple hair and a patchwork physique adorned with protruding screws, echoes the visage of *The Bride of Frankenstein*. Crafted by Ryu Kutou—alias Abel—she wields the power of Nothingness, engineered to consume souls and sever the cycle of reincarnation. Designed as a harbinger of oblivion for Abel’s scheme to annihilate existence, she emerges as a linchpin in the narrative’s metaphysical warfare.

Initially detached and mute, Stealer defies her destructive programming by forging an unexpected bond with Linne Amagane, whose compassion sparks her rebellion against annihilation. This alliance drives her to confront her purpose, culminating in a climactic self-sacrifice where she absorbs and obliterates a maelstrom of negative energy, transmuting into a colossal, crucifix-shaped tree that stabilizes the collapsing world.

Post-cataclysm, her arboreal form stands as a silent sentinel within the restored Academy. The tale closes with a reborn Stealer, bearing her original name and an unspoken kinship with Linne, reuniting in the human realm—a testament to their enduring connection transcending lifetimes.

Her genesis as Abel’s instrument and metamorphosis from destroyer to savior mirror themes of autonomy and redemption, framing her as a nexus between fate and free will within the story’s exploration of purpose.