Grimm is a tall, lean figure swathed from head to toe in feather-tree bandages, their ivory fibers offering protection and healing. Crimson-lensed glasses frame his eyes, while bandages adorned with painted fangs conceal his mouth. A black pointed hat crowned by a feather perches above his draped cloak, gloves etched with an eye sigil, and a belt hung with weapon-storing scrolls. His calm, polite demeanor masks battle-honed instincts and a habit of third-person speech—a deliberate practice of illeism to maintain emotional distance. Yet beneath his composure lies a crippling blood phobia, compelling him to meticulously contain his own to avoid contamination.

Introduced in Rumble Town, Grimm initially clashes with Seth, misidentifying him as an ally to antagonist Hameline. After resolving their conflict, he aids Seth in repelling cannon assaults, heals his wounds, and shelters witnesses hunted by Konrad’s machinations. This alliance draws him into Seth’s group, joining their pursuit of the Radiant.

Grimm wields Fantasia to channel dark blue energy, distinct among sorcerers, through musically named spells: *Procella* unleashes azure beams, while *Veneticium Revelare* summons slashing tornadoes. A broom propels his flight, and a coffin serves as a portal to his hideout. His bandages deflect attacks, and his sword, Kannibal, accelerates with each strike. However, blood-related panic and impulsive choices undermine his calculated exterior.

Functioning as a shadow archetype, Grimm embodies contradictions that unsettle Seth’s worldview. Cryptic and detached, his enigmatic choices breed confusion, yet he later steers Seth through internal strife during events like the Dullahan incident, symbolizing emotional integration. His origins and motives remain veiled, preserving an aura of intrigue as he navigates the narrative’s shadows.