Crane is a high school drop out. He was often bullied/pushed around because the people at his school didn't like how he acted and thought that he was a selfish brat.
Crane eventually dropped out and didn't look back. His dad supported him in the choice to drop out.
Over the years Crane found Heart and Jack. Heart and Jack try their best to keep Crane in check, but sometimes Crane overpowers the two and manages to get away with Crane antics.
Crane found Heart and Jack when he needed them most. He was diagnosed with depression after he ran away from home.
Crane ran away from home when he was only 19. He only ran away because he was having a break down and his dad wasn't there so he felt like a burden to the family.
Eventually he got diagnosed with ADHD and PTSD as well. He does his best to embrace it and go about a normal life even though he tends to stay up for days and passes out at the most random times.