Sayo Samonji is one of the Samonji blades. A tantou who is obsessed with revenge thanks to his historically Dark and Troubled Past.Some of his lines are downright creepy and he shows plenty of Troubling Unchildlike Behavior, but this is mostly influence of his former master, whose wish was solely revenge. It's implied, particularly by Sayo's line when he's destroyed, that it was never Sayo's wish to hate anyone.