1. So it’s no secret that I really wanted Uta’s darkest secret to be that he is the original One-Eyed King. However, since this looks lesssssss likely atm, we’ll try something else. But! This is the headcanon I desperately wanted.
2. Uta’s darkest secret is that he once helped Arima Kishou, even knowing that Arima killed Renji’s sister. You see, Uta has known about the Washuu Garden for a long time, and done nothing. That the very people who have oppressed ghouls are ghouls themselves, who rape and kill and use children like pawns in a bid to become human, is too much despair for Uta to bear. So he helped Arima, just once, get out of a tough situation. It still felt like a betrayal of his friend, though.
Sometimes he thinks of telling Renji. But he’s almost more scared of Renji’s forgiveness than his rage.
Mercy and Magic 