Yamato DeLuca-Hanazono ; 'Brother' ; ~ "Cone."
In most cases, it takes Kazuo a while to trust someone—a warm-up phase, one could say. Over time, the two have become familiar with each other, and a strong sense of loyalty has formed. All DeLuca brothers seem to share a similar sense of sanity and morals.
Yamato feeds Kazuo's sweet tooth and reminds him to commit to human needs like eating and sleeping. They've also shared quite the time, totally not being criminals.