Gremmy Thoumeaux

Gremmy wears the face of a child, with tousled blond hair, soft youthful features, and red eyes. His take on the Sternritter uniform is a loose white trench coat topped by a hood and a tall collar. That boyish figure, however, is only something his own power conjures; his genuine self is a solitary brain sealed inside a protective casing.

Gremmy is certain that imagination is the mightiest force in existence, and he takes enormous pride in commanding it. He can be casually cruel, snuffing out Guenael Lee the moment the creation proves too weak, and he boasts of slaughtering defenseless captains while making a girl's bones brittle as cookies. Yet he also shows a strange courtesy, judging it only proper to build a fitting battlefield for Kenpachi Zaraki. Beneath the manners sits towering arrogance: he names himself the strongest Sternritter and swears he will beat Zaraki without lifting a finger, indifferent to the comrades a summoned meteor would kill alongside his foe. Having never met anyone worth destroying, he is startled to feel a real hunger to crush Zaraki, and in his last moments that confidence gives way to loneliness at the thought of a world holding no imagination.

Judged too dangerous to roam free, Gremmy was confined before the Wandenreich released him for the war, over the objections of Sternritter like PePe Waccabrada. After the group's first strike on Soul Society and Yhwach's naming of Uryū Ishida as heir, Gremmy appears inside the barrier shielding two wounded captains, kills the officers whose lives he had already claimed, and casually cripples Yachiru Kusajishi before Kenpachi Zaraki arrives.

Their duel becomes a showcase for his Schrift: he mends any wound by imagining it already healed, conjures lava, water, and stone at will, and reshapes the ground into a fighting stage. When Zaraki works out that Gremmy loses his grip if his focus is divided, Gremmy turns serious, discovers his own wish to kill, and buries Zaraki under machine guns and missiles. Realizing he can accidentally imagine his own death, he thanks Zaraki, then reveals his greatest ability, cloning himself to double his imaginative power and dropping a colossal meteorite meant to erase the entire Seireitei.

Zaraki splits the meteorite with a single swing of his true Shikai, leaving Gremmy stunned. The Quincy tries a formless kill by wrapping his enemy in the vacuum of space with an army of clones, but Zaraki endures, and Gremmy, desperate to win, forces his own power up to match him. His fabricated body cannot hold that much strength and tears itself apart. As his brain slips free and his imagined form dissolves, he admits he lost because no body but Zaraki's could contain such force, and he dies mourning the imagination-less place awaiting him.