Movie
Description
Medama Oyaji, father of Kitarō and a former Ghost Tribe member, contracted an incurable "melting disease" while secluded with his pregnant wife Iwako. To support them, he sold his blood, inadvertently causing transfusion recipients to resemble ghosts. After both he and Iwako succumbed to illness, his spirit willed itself into his last intact body part—his eyeball—following Kitarō's posthumous birth, resulting in his current anthropomorphic eyeball form to guide his son.

Physically, he manifests as a small, nude creature with a giant eyeball for a head and a diminutive body. His eyeball head features a visible eyelid and a rarely seen mouth beneath, capable of extending or retracting. Though typically toothless, he consumes foods like cherries, plums, fish eye soup, and morning dew. He occasionally wears accessories like a silk hat or a single shoe. Before decay, his illness caused him to resemble a bandage-wrapped mummy. The 2018 anime depicted a healthier pre-decay form within a dream dimension—a human-like figure with gray hair covering one eye—though this may not reflect his true historical appearance.

His abilities encompass extensive knowledge of yōkai lore and occult subjects, aiding Kitarō in resolving supernatural conflicts. He possesses body manipulation skills, substituting himself into empty eye sockets to restore vision or controlling substances like mochi for combat (e.g., "Reverse Mochi Murder"). Despite his size, he unleashes potent "Finger Guns" (Yubi Teppo) attacks. He maintains a personal connection with Enma-Daiō, ruler of the underworld, facilitating travel between realms. As a pre-decay Ghost Tribe member named Gegerō, he wielded greater physical prowess and techniques like "Internal Electricity," as shown in the 2023 film *The Birth of Kitarō: Mystery of GeGeGe*.

His personality balances deep paternal devotion with scholarly wisdom. He frequently expresses concern for Kitarō's safety, weeping openly when his son faces danger. He enjoys bathing in small vessels like teacups, bowls, or cola, emphasizing his fastidious nature. His portrayal evolves across adaptations: earlier series highlight anxiety over Kitarō's battles; the third anime shows support for Kitarō's human relationships; the fifth series introduces comedic traits like exercising or watching television; the sixth series explores his guilt over burdening Kitarō with his diminished form. In *Hakaba Kitarō*, he exhibits a harsher, less nurturing demeanor, often chastising Kitarō for ignoring his Ghost Tribe heritage.