What do you think about the Kirishima siblings? I think they are really interesting and I am sad I can't find many meta about them. They have common themes: they both are conflicted and present a duality in their behaviours (Ayato even more than Touka), they both like rabbits for unknown reasons. They have similar personalities and yet they end up taking completely different paths. In the Tokyo ghoul trumps Touka having one wing is the ace and Ayato having two wings is the two.