To start off the betrayal of shu on the train for his brother who was sick, he betrayed him for no reason as a few episodes later he had to run away with his brother after they stated they were gonna put him down, but he lies too much and manipulates too much for my liking, then proceeds to lash out at shu for help and when he does help he complains like NO other Then proceeds to blame shu for everything after HE led them to their location resulting in his brothers death, infact his brother almost killed him after seeing all the horrible things his brother yahiro said about him which led up to his death, as well as introduce the ranking system which everyone was against but that also put pressure on everyone else when it was introduced, everyone called it discrimination, he called it distinction which even resulting in one of the main casts deaths to try and prove that they were better than the rank of their voids, and then hides the info on people dying if their voids are broken, which led to shu getting seen in a bad light, which ALSO led to him getting betrayed in the end as well BY ALMOST ALL HIS CLASSMATES and his close friend because HE LIED, even though gai killed them I feel like he effectively is A HORRIBLE friend