Garterbelt acts as Daten City’s reverend and the Anarchy sisters’ guardian, charged with directing their mission to eradicate Ghosts. Cursed with immortality, he cannot die until completing an unspecified divine task. His history paints him as a former criminal who ascended societal ranks via extortion, murder, and prostitution until his assassination. Post-death, he rejected a heavenly mandate, triggering divine retribution: a lightning strike and a temporal trial forcing him to witness events from dinosaur extinction to biblical tales and historical wars. This odyssey taught him that enduring pain might yield future contentment.

Garterbelt exudes stern authority, often chastising the sisters’ recklessness while masking his own shadowed impulses. He engages in bondage and operates under the alias “Master G,” targeting young men like Brief. A booby-trapped passage in his church hides a diary chronicling his criminal past and immortal journey. Its pages cryptically reference “GB”—“G” denoting God and “B” hinting at Brief, suggesting unresolved ties to divinity and mortals.

Within official narratives, he advises on Daten City’s locales and covertly manipulates figures mirroring the Anarchy sisters in private settings. Though abrasive, he intermittently employs pragmatic guidance to temper their chaos. Spin-offs and OVAs retain his core traits—immortality, concealed vices, and the clash between his sacred duties and earthly desires—without expanding his arc.