Agent Valentine

Life
Agent Valentine, or Nick Valentine, was born on Titan in the Jovian Inner Colonial Government on June 8th 2516. He was born in the Boyle Sector there and was transferred to Old Chicago to be raised. His mother was a drunk and constantly beat him, so he had to learn how to run and how to find out when and where she was going to, as well as save her from nearly committing suicide. His father stayed with his extended family on Titan. When Nick was eight, his father died of murder, causing a deep depression in his household for over a year. He decided to investigate and over the ConWeb, he found the killer. His name was Wyatt Davis, a serial killer known for random murders, and he got plenty of money and honor for finding that out. After that, he was observed by ONI for later intel and possible drafting. Three years after, his mom died, so he was sent to his uncle Dave Valentine on Mars to be raised for the rest of his life. The uncle of his almost instantaneously enrolled him into a private military school to be trained as an ODST and hopefully bring a good name to the Valentine family. Valentine was a top investigator and crime solver there, even finding out a plot on his life by his own student, Marc Phillis, and brought him to justice... after he beat him to near critical condition, of course.

Necros
After he found out and arrested two criminals, he was put into PROJECT: Necros, a secret experiment that had young people take Spartan SII level drugs. He survived and was taught many fighting techniques, tactics, weaponry skills, learning basic Covenant languages, using Covenant weapons, and such other things like survival on other worlds, etc.