Yuuri holds the position of one of the "four sages" in the series, serving as an envoy frequently summoned by Muhyo. He was deployed specifically during the conflict against Pluto.

In his standard state, Yuuri appears with a long, domed head bearing three eyes set horizontally. He dons a black-and-white spotted cloak and possesses a long white beard.

Upon unleashing his power, Yuuri undergoes notable physical alterations: his eyes turn white and reconfigure into a triangular arrangement, while his beard extends significantly. The cloak transforms into pants, and his arms gain a more muscular, robust form.

The name "Yuuri" originates from the Japanese kanji "幽" (yuu), signifying "seclude," "confine," "deep," "profound," "faint," "dark," "tranquil," or "calm," combined with "李" (ri), meaning "plum" or "prune."