Yeah he's not a real 'person' but a mixture of three great swordsman. Let's see, Lord Yamagata was real, so was Saitouh Hajime, and the Shinsengumi did exist and he was the commander of the Third Squad, the attack, the gatotsu...i don't think its real but the parralel sword did exist. and there's one other but i can't remember...i love the show!