[HE GIVES HER AN UNCERTAIN LOOK... Was it really teasing, Taiwan. Was it. And if so, rude!! But he'll explain anyway because he can't not...]

There're a bunch of differences but the easiest one to remember is size. Oodachi are a lot bigger! Even tachi are bigger than we are. We were refined for samurai by the time I was forged, so we're lighter and easier to cut with.