Movie
Description
Ido-Sennin, a human from ancient China, ventured to Japan millennia ago and took refuge in a well. Prolonged immersion in the well’s methane gas mutated him into an immortal yōkai, a transformation that instilled a lifelong duty to protect Japan from existential dangers.

His grotesque form features an oversized, lopsided head with sunken, mismatched eye sockets—the left larger than the right—housing tiny, glittering eyes. Stringy hair clings to his scalp, framing a noseless face marked by thin, wrinkled lips concealing jagged teeth and skin mottled with fungal growths. Cloaked in tattered robes and leaning on a gnarled walking stick, his presence exudes eerie antiquity.

Brash and sardonic, Ido-Sennin oscillates between ally and irritant to the Kitarō Family. The 2007 anime situates his well in Yōkai Yokochō, where he dispenses arcane remedies to quell supernatural crises, often clashing with Medama-Oyaji. Though his sporadic aid in the 1971 series evolved into recurring roles in the 1985 and 1996 adaptations, his acerbic wit remains constant.

A repository of Eurasian yōkai knowledge, he crafts specialized cures and wields the All-Purpose Glass Ball, a crystalline orb that exposes hidden truths. His narrative threads through countless threats alongside the Kitarō Family, deploying mystical solutions with clinical detachment.

Across eras, his allegiance to Japan and the Kitarō lineage endures, tempered by a disposition that prioritizes pragmatic intervention over sentimental bonds.