Thread:Mesektet/@comment-27729149-20151002041329/@comment-3581997-20160122113912

In a word, "Focus". Stein has an specific goal in life, seeing how far he can push learning, that is his primary goal to keep his attention. Kenpachi knows he can do anything, which is why he doesn't spilling blood of innocents would be right up there with eating his own snot, so simple it's pointless which is why he places his attention purely on the pursuit of challenges. Kurama as discussed is coming to terms between a past and current life. But even in his past life he was focused entirely on tasks set before him and how to overcome them, it was never about just having fun, it was about challenging himself, where Kenpachi kills things to challenge himself and prove what he can do Kurama/Yoko-Kurama (past-life Kurama) would commit heists to prove to himself that he could and devise creative tortures for those who prevented said heists from going like clockwork.

For all of them, it is a matter of living with the power they have. Giving one's mind a focal point to kill the tedium means that just going around doing whatever will become very boring, very quickly