Ryou (涼)
"Cute girls, booze and party nights, what could one even want apart from that? I'm not here for a long time, I'm here for a good time. Now are you in, or not?"
"Rottan all the way down"; that's a term that Ryou has gotten rather used to hearing in their comparatively short life. As a result, he has been an outcast for the longest time; but at this point, all power to care about such petty rankings of social hiearchy has become utterly pointless.
They have decided to go for it, and simply live like tomorrow is not a guarantee. Every day like your last day, even if it destroys you. That's when they go on a walk to find someone around their age, a quiet "ice queen" named Setsu.
Someone with the same desires for destruction and chaos in the world, ready to go on a chaotic rampage with him; would there be anyone more perfect to team up with, and of course, court?
When others describe him as "cruel" and "rotten", he finds those to be pretty accurate summarizations of his character. He isn't particularly interested in other people or their plights, and he likes to cause problems. On purpose.
When they meet Setsu, these tendencies only become stronger. She seems innocent on the outside, but Ryou can tell - she's just like him, deep down. They want to wreak havoc with her, and sit on the flaming pile of garbage that is their lives.
( partner (+ in crime) )
The two of them have a fateful meeting one night, and Ryou is smitten with her, seeing the same toxic traits in her as they see in their own life. The two of them start hanging out and the relationship quickly and drastically escalates over time.
He wants nothing more than to sink to the depths of hell with her, living in the very pyres of chaos just the two of them.