Seikū King is a Tenshi affiliated with the Akuma vs. Tenshi Seal and Shin Kessen Akuma vs. Tenshi Seal series. He acts as a celestial spokesman for the higher entity Seishin Nadia within the lore. Seikū King plays a key role in a major historical event, delivering Nadia's gifts—Super Zeus and Black Zeus—to Tenshi leader Shaman Khan and Akuma leader Shiso Jura. This act unleashes consequences when Jura betrays Khan, attempting to absorb both young gods for personal power and fracturing the world into separate Tenshi and Akuma realms. Seikū King witnesses the betrayal alongside Nadia and observes the subsequent battle between the factions.

In the separate narrative continuity of the *Super Bikkuriman* television series, Seikū King is a member of a resistance group alongside Phoenix and Rojin Hood. During an Akuma assault on their hideout in episode 2, he alerts his allies to the impending attack. Following the base's destruction, he is presumed captured or killed by Akuma forces, with his ultimate fate unresolved.