Horohoro is good-natured and cheerful, but he gets serious in dangerous situations. He argues constantly with his teammate Tao Ren, and they do not seem to get along at all. However, it is shown that he really does care for him when, in the manga, he tells Yoh Asakura that if he can't save Ren, as his friend, HoroHoro would never forgive him. Horohoro is also very secretive about his past not willing to talk about it even to his friends. In addition, Horohoro can also get very competitive, even going so far as to turn Ryu's arms to ice and shatter them during the fight between The Ren and Funbari Onsen. Horohoro's name sounds and is spelled (in Katakana) like "boroboro," which means "crap" Characters mispronouncing/misspelling his name is a running gag in the series. It's later reveled that Horohoro's real name is Usui Horokeu.
In Shaman King: Kang Zeng Bang, Invading plants, he got furious by Kalim mentioning is true name, he claimed that he threw that name because that was the named that killed the girl he loved, it was revealed that Damuko, Horohoro's childhood friend and crush was actually Kororo.