I will never not be mad about this. Literally built up as the ultimate killing machine. Ishida himself describes Arima as 'massive and sadistic'. The Haise and Arima relationship had the potential to be one of the best things in this manga having Kaneki see him as a father, while he sees him as his own weapon and ultimately the best prey he could find. Not only does having Arima being a remorseful faggot who loved Haise be a asspull that destroys everything that was built up between the two, but it being revealed that he planned to let Kaneki just kill him completely killed everything that I wanted since the 1st fight. Arima could've been the One Eyed King of V, while Kaneki the One eyed King of ghouls. Everything Furuta has done would have been much better if it was Arima in his position.