Poseidon is one of the Ten Elders and the reincarnation of the Greek god himself. He can float and blast pressurized water from his hands, though his minimal wardrobe—just a loincloth—has earned him the unflattering nickname "Nudist" courtesy of Princess Suya.
When humans stopped worshiping the gods, Poseidon had to reincarnate and start over with a child's body. The Former Demon King Oxenthree took him in and raised him alongside his own son, Twilight, and Poseidon's older brother Hades, who'd also reincarnated around the same time.
Despite finding Suya's antics annoying more often than not, Poseidon consistently falls for her schemes anyway. Once a year on Marine Day, a surge in magical energy lets him shift into a more adult form—something Suya never recognizes him in, though his personality doesn't actually change.
He's genuinely thrilled when Zeus shows up at the Demon King Castle and decides to stick around, excited by the chance to finally act like an older brother. The problem is he's never actually done it before, so he gets flustered easily around Zeus and struggles to show how he actually feels.
Content compiled by AnimeList.moe from publicly available sources.
