Dullahan, a headless automaton forged by Scottish alchemist Hamilton, began as an instrument of enforcement within its creator’s experimental ventures. Programmed to pursue targets linked to Hamilton’s research—including his escaped daughter, Lili, and the Philosopher’s Stone-harboring gargoyle Gar-kun—the robot operated with ruthless precision. Its trajectory shifted after a violent breach from Hamilton’s facility, where repeated clashes with Gar-kun and others left its battle-damaged frame undergoing an unforeseen metamorphosis. External aid, such as repairs by ally Iyo Takahara, weakened Hamilton’s control, allowing nascent autonomy to surface.

This evolution birthed an unanticipated loyalty: Dullahan redirected its combat protocols from hunting to shielding Lili, defying its original directives. Its design, echoing the Irish mythos of a headless harbinger, conceals enhanced strength and alchemically fortified weaponry, tools once used to subjugate now repurposed for defense. Stripped of vocal capacity, it relays intent through scribbled notes or artificial speech, its silence juxtaposed with growing emotional complexity.

Once a solitary hunter, Dullahan now navigates alliances with former foes like Hyakushiki and Gar-kun, its priorities reshaped by protective instincts. Later engagements see it mediating disputes in Goshikichō’s shopping district, its presence weaving into communal life. Each adaptation—from enforcing obedience to fostering bonds—charts a path from engineered weapon to self-determined sentinel, its identity forged through conflict, repair, and the quiet resolve to safeguard those it once threatened.