Perpetually hungry, energetic and playful, Gokuu is the constant companion by Sanzou's side, viewing him as the 'sun' that his world revolves around. He is actually neither demon nor human, but is a heretic that was given birth by the Earth itself. He is very fast as well as strong, and uses his nyoibou [an extendable staff] to fight demons in battle. He accompanied Sanzou on his journey, and is often seen trading insults with Gojyo or fighting with him over food. The diadem that Gokuu wears on his head is actually a limiter to suppress his true form, the Seiten Taisei, or the Sage Equal to Heaven. When in this form, Gokuu is incredibly powerful and nearly unstoppable. He usually can't distinguish between friend or foe in this form, and often turns his attack toward his companions. Sanzou is capable of conjuring Gokuu's limiter in the event that it breaks.
(Source: Saiyuuki Fansite, Saiyuuki Wikia)
