Hydra Ichi (海蛇座（ヒドラ）の市, Hidora no Ichi) is a long-time friend and comrade-in-arms to Sagittarius Seiya. Ichi is the oldest student in the Palestra in the era of Omega. In the first season of Omega, Ichi was still trying to discover the element of his Cosmo. In the games Saint Seiya Omega - Ultimate Cosmo and Saint Seiya Omega Card Crusade, Ichi has two different elements, Earth and Water.