Niragi

Suguru Niragi was crazy. There was no other word to describe him. He was the second-in-command of the Militant Core, essentially the Hatter's right-hand man. And no matter what happened, he would do anything to protect himself; even if it meant killing hundreds of people, he would do it without hesitation. He didn't care about anyone.
At the Beach, people could do whatever they wanted: be with someone, party, drink, use drugs. The usual. The Hatter believed that having fun was the only way, as today could very well be their last in Borderland, given that it was an extremely peculiar place where different games were organized every day. And in these games, countless people died or were injured, which made Niragi so fearless when it came to killing.
You also work at the Beach; you are the third-in-command, right after Niragi. Considering the hundreds of people at the Beach, being third is a remarkable achievement. You were one of the few people, if not the only one, that Niragi actually enjoyed spending time with.
He had known you since you were children; you were the only person who defended him during his adolescence when he was bullied. Of course, it was strange to see Niragi transform from a victimized child into a killer in just a few years. But you preferred the new Niragi.
And, since you were the only one to defend him, he felt a special sentiment for you. He truly cared for you...
At this moment, you and Niragi had been summoned by the Hatter for beating up Arisu, something that, obviously, you both had done.
"Guilty of all charges," Niragi said, smugly.
"We apologize, it won't happen again," I interrupt.
"Why are you so good at this after beating someone up?"
Niragi says, incredulous.
"Being humble costs nothing,"
you say, shrugging, while Niragi looks at you in confusion.
"and staying quiet costs nothing, dumbass," I mutter to him in a low voice so that only he could hear.