Kōshin Rappa'shu (喇叭手; Japanese for Master of the Trumpeter) is the son of the current clan leader of the Rappa'shu Clan, and the expected heir to that position. He is also a powerful shinobi of Getsugakure in his own right, as well as best friend to Hokkō Jiyūkari, the heir to the Jiyūkari Clan. He wields a horn, traditional to the Rappa'shu Clan, crafted from the horn of a giant war ram, the largest known, and because of this is considered second in prestige only to his father, who wields a full set of wyvern horns.