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Ido-Sennin has a large, deformed head, with large, sunken eye sockets housing two beady eyes. His left eye socket is normally depicted as larger than his right. He has long, stringy hair, no nose, and his lips are thin and wrinkly with sharp teeth. His skin typically appears to be covered in mold, usually with spot all over his face. His body resembles a normal human body clad in a robe. He usually carries a large walking stick with him.
Ido-Sennin can be very snarky and straight to the point. Because becoming a yōkai while in Japan has allowed him immortality, he feels indebted to Japan and will eagerly help out if the country is in danger.
Ido-Sennin was once a human from China. A several thousand years ago, he journeyed to Japan and began to live in a well. He lived by breathing in the methane gas in the well, and over time he evolved into a yōkai. He has a vast knowledge of Eurasian yōkai and magic and is proficient in the ways Yōkai medicine and tonics. He also possesses a crystal ball called the All Purpose Glass Ball, which can reveal the identities of unknown culprits.
He only appears sparsely in the 2nd anime.
Starting from the third anime, he frequently helps the Kitarō Family.
He appears in the third movie based on the third anime adaption, GeGeGe no Kitarō: Saikyō Yōkai Gundan! Nippon Jōriku!!
Like in the third anime adaption, he helps the Kitarō Family rather frequently.
In the 5th anime, Ido-Sennin's well is located in Yōkai Yokochō, and he often appears to help resolve incidents that require the mystical substances and medicines he can create. In this adaptation he is depicted as fairly snarky and does not get along too well with Medama-Oyaji.
|Ghost Tribe||Kitarō • Medama-Oyaji|
|Other members||Nezumi-Otoko • Neko-Musume • Sunakake-Babaa • Konaki-Jijii • Ittan-Momen • Nurikabe|
|Former members||Shisa • Yuki-Hime • Netarō|
|Recurring allies||Yobuko • Kasa-Bake • Abura-Sumashi • Tsurube-Bi • Bake-Garasu|
|Yōkai Apartments||Nekoko • Kamikiri • Azuki-Arai • Akaname • Tsurube-Otoshi • Gyūki|
|Yōkai Yokochō||Kawauso • Amabie • Rokuro-Kubi • Ohaguro-Bettari • Nurikabe-Nyōbō & Ko-Nurikabe|
|Other Allies||Maruge • Ido-Sennin • Bake-Kujira • Yagyō-san • Aobōzu • Simurgh • Agnès|
|Tendo Family||Yumeko Tendō • Hoshirō Tendō • Masao Tendō • Yūko Tendō|
|Elementary School Trio||Yūko Murakami • Shōta Suzuki • Jun Tanimoto|
|Others||Mizuki • Makoto Washio • Mana Inuyama|
|47 Yōkai Warriors|