!!!Cossus is part of the Yiga clan, he's actually a blade master he's just the youngest and the smallest one His entire village was wiped out by Master Khoga himself and they left only Cossus alive They brought him up in the hideout and taught him that the champions were trying to return calamity ganon (lies so that the yiga would have reason to attack them) He keeps the yiga title until the calamity hits so that Tifu can pass information on to the others and then afterwards he quits and spends the rest of his life trying to bring them down (he does not succeed :(] but! in-game, there is a little Easter egg from cossus in the clan hideout