Rocket never got along with his dad. One day, Rocket bought fireworks for a special occasion, but it started raining. he still wanted to celebrate it, so he tried to light it, hence his scar. his dad was mad because he was making a racket and a mess again and they had enough. In short, Rocket was living buy himself, struggling to make it though everyday. That day was his birthday. He was lonely for a year and a half until he ran into Adler. they got to know each other and were great friends. Rocket still sometimes get panic attacks and Adler is there to comfort him (Sorry this backstory seems a lil wonky, I'm working on an essay and that uses all my brainpower) (btw, "olivia" is Rocket's pet lizard, a stress reliefer pet thingy and stuff. he loves her very dearly)