change is inevitable

in all of the 15 years killua zoldyck has lived, he was always treated differently because of the way he acted. when he was younger, this fact had left a few scars on him, but as years went by, he learned how to cope with it and realized that this was the way things were supposed to be and he just had to suck it up.

by the time he was in 8th grade, he had stopped talking to classmates at school, only communicating with them when needed to, like a group project. but other than that, that was it. and because of this, he had focused more on school and such.

that all changed when a new boy came by, he was a bit startled about someone joining mid term but he couldn't really care less. but that was before he had seen the way he acted towards him, and from then on, everything turned upside down for the zoldyck...

or
killua is a loner at school and gon comes along and changes everything like the Ray or sunshine he is.