Kororo, also known as Kororo Usui, is a supporting character in the anime and manga series 'Shaman King.' She is the spirit partner of Horohoro (Usui Horokeu), aiding him in his quest to become Shaman King. Kororo is a small, gentle, and kind-hearted spirit who takes the form of a tiny, blue-skinned girl with an affinity for ice and snow. Her loyalty and support are crucial to Horohoro's growth as a shaman throughout the series.