Let them hate, so long as they fear.
Callixus was born into a wealthy family only for his father to discover his wife had been cheating on him. The man he thought was his father could not be more uninterested in being a cucked man; raising a boy that wasn't his own. At 8-years-old, Callixtus was forced to leave with his mother after the divorce where he suffered near shock from living a life of luxury to being stuffed in a one bedroom apartment.

Unfortunately, fitting in wasn't an option for Callixtus. His peers saw him as a spoiled brat and he learned he needed to be several times more aggressive than them to ward of bullies and teasing. With this happening as he was reaching the age where he was supposed to develop into his own person.

The result? A bitter man who acted rash and acted out. He made hoodlum friends and they ran around freerunning for fun. He was pressured into joining the military with one of them where he found he was able to have a steady income and put his skills to use.

Callixtus was able to abuse the system heavily once he found his place in the organization. He was just a manipulative person who lived in the moment and didn't plan too far ahead. His terribly headspace was what ultimately caused him to shoot himself in the foot. He ultimately got caught doing one too many shitty things and was a candidate to be fired. His career was barely saved by someone ranked above him. Callixtus didn't change, he simply learned to navigate the world more discretely as he worked on his reputation to the best of his ability.