Mubi is a Hidden Rain ninja and he is in the same team as Oboro and Kagari. His team fights using mainly genjutsu and clones to hide themselves so that he and his teammates can attack their enemy where they least expect it. They can also change mist clones into solid water clones without being noticed so that they can attack with many clones using taijutsu instead of genjutsu to inflict physical damage instead of illusory damage. To the enemy the clones will still look the same. But if they attack a clone, unlike a mist clone, it will become a puddle of water when hit.
Mubi and his team fought in the chuunin exam's second examination round in the forest of death and were beat by Naruto, Sasuke, Sakura and Kabuto. Soon after the chuunin exams the team was hired along with Aoi to make sure that the ceremonial runner of the Land of Tea does not win the ceremonial race. They managed to trap Naruto, Sasuke, and Sakura underwater and almost drowned them. They almost succeeded in their mission, but Naruto managed to free himself and his squad and beat Kagari, Mubi, and Oboro once again.