Snake King Kaira, also known as Lord Ananta or Jaou Kaira, is a prominent Rank S Water-attribute Yo-kai within the Yo-kai Watch franchise. Initially affiliated with the Enma tribe, later media like Yo-kai Watch 4 link him to the Izana tribe. He is a "han'you," or half-Yo-kai, descended from both human and Yo-kai lineages, leading to personal conflict over his identity. His appearance features medium-length dark blue hair and snake-like eyes with dark blue irises, oblong pupils, and dark red circular patterns. He wears a black V-neck shirt and pants under a white kimono adorned with blue arrow motifs, a gray and blue boa draped from head to legs, and long black boots with blue buckles and cream soles. He wields the "Jaou Ken" (Snake King Sword), a straight katana with a blue "no-hi" groove, a black edge, and gold wave-patterned hamon, generating multicolored snakes from his palm in combat. In the Shadowside continuity, he becomes ruler of the Yo-kai World after deposing Lord Enma, resenting the lack of recognition for his authority. During the film "Oni-ō no Fukkatsu," he opposes Enma, seeking to control the Oni King Rasen with the Fudou Raimeiken sword. After Enma escapes and confronts him, they reconcile and unite against Rasen. Their combined efforts and fused powers contribute to Rasen's defeat, concluding with Enma formally designating Ananta as his successor. In the Shadowside anime, he continues as ruler while supporting the Yo-kai Detective Agency, aiding in locating the Sacred Armory against threats like Shutendoji and warning about "The Gloom," an entity corrupting Yo-kai. His video game roles vary. In Yo-kai Watch 4, he appears as both a playable character and a boss; his Shinma form serves as the penultimate boss in Chapter 10. Befriending him requires a multi-stage quest delivering scrolls to characters like Arachnus and Toadal Dude, followed by sequential battles against themed Yo-kai teams. After a final battle defeating Ananta and his attendants, he joins the player's team automatically. In Yo-kai Watch Busters 2, he becomes recruitable in the Wandering Arena after completing Chapter 2. In Yo-kai Watch: Wibble Wobble, he appears as a Rank SS Yo-kai with a Rank SSS Shinma variant, possessing the Soultimate move "Snake King Rebellion Prison Wave," which damages a single enemy while restoring his HP. A 2024 event introduced a corrupted clone, Jaou Kaira Kegare, described as cruel and tyrannical, wearing violet and purple attire. His Soultimate, "Impure Snake King Rebellion Prison Wave," is an area-attack that also heals him. His backstory reveals he was imprisoned for millennia as punishment for opposing Enma. Early lore positions him as Enma's rival, though they eventually reach mutual acceptance. The name "Jaou Kaira" translates to "Kaira the Snake King," while "Ananta" derives from Sanskrit, meaning "endless" or "infinite," referencing serpent symbolism in Hindu mythology.