I strongly agree with your comments on Byakuya and Toshiro. Byakuya is a cool character and has strong powers, but he should have been killed off. I feel like Kubo does not really know what to do with him tbh.Byakuya Kuchiki: I respect a strong silent type, but when he throws in the superiority complex its annoying. He should be dead....but fan service gave him a ludicrous power up instead.
Kenpachi Zaraki: single handedly destroyed all of Unohana's hype, and killed her off. The biggest waste of a good potential character. Which after his win, acts no differently than he did before...making her death pointless.
Toshiro Hitsugaiya: The amount of times the "cool level headed" child genius gets emotionally played is pathetic. It's almost like all he can do is talk big and act cool....but when the. Nail needs a hammering he hits his thumb.