Bui is the least seen and least evil member of Team Toguro. He is almost always seen wearing armor over himself, although it is revealed in the anime that he is a somewhat middle-aged man with short light blue hair and a scar on the center of his forehead when he takes his armor off during his battle with Hiei. He rarely ever speaks, and when he finally does it is revealed he has a particularily eerie voice. Bui's goal in the tournament was to have a rematch with Younger Toguro, using the tournament as training. Bui and Karasu some time ago fought and lost against the Toguro Brothers, and each of them then joined their force under the premise they would one day have a rematch.