@Zara super late but it's the first two letters of Katsuki name then chan added which is how kids would address eachother

@Lyssa ooh thank you I'll go check them out

@Gompachiro same t

@bella I ammm

@hiiii AHH

@WhatAmIDoingHere yall just haters it was my opinion at that time

@HAWKSUA no it means older brothe

@Luna I've read that but thank