Santori, called "The Peak," serves as a Colonel among the Inquisition's elite Thaumaturges. His imposing height and lean physique are marked by a segmented beard clasped with metal rings, a face shrouded beneath a wide hat's frill, and eyes rarely visible. He wears a dark, knee-length poncho over patterned breeches, his unkempt appearance emphasized by overgrown nails and coarse calf hair. Scarred muscle and gnarled joints beneath his robes testify to decades of warfare.

A whirlwind of vigor despite his years, Santori confronts conflicts with booming laughter and relentless zeal. He craves battles against worthy foes, deriding lesser opponents as disappointments. His habit of recounting past triumphs—only to proclaim each new challenge superior—reveals a thirst for escalating thrills. Though clinging to optimism, he privately laments the world's diminishing capacity to ignite his fervor.

His Miracle, "Patrem Inquisitor, Founder of the Miracle, May your Greatness Tower Over the Nefarious," conjures destructive projections of his limbs or body through a sigil on his back. These replicas mimic his actions, disintegrating matter they strike, though injuries they sustain rebound to him at reduced severity. While stationary, he unleashes multiple phantom limbs; movement restricts him to singular projections. Misapplication risks self-harm, as seen when overextension turns his power against him. During Cyfandir's battle, he acknowledged that colossal manifestations require coordination with fellow Thaumaturges Ullmina and Liselotte.

Santori's duel with Seth exposed philosophical rifts—the rebel accused him of blind servitude to the Inquisition, provoking Santori to question whose ideals truly enslaved them. This confrontation epitomizes his role as the Inquisition's unyielding instrument, navigating moral gray areas to uphold their cause. His survival through countless battles cements his legacy as a battle-hardened zealot, eternally chasing the next conflict to test his eroding world's dwindling stakes.