Beginning
It's hard to say what is a good upbringing or a bad one. Perhaps an impossibility. Though saying that Luc had a special kind of upbringing could be quite true. Born Gabriel Raynor on the colony of Aquaria. Mother dying in childbirth as they had recently gotten to the colony and his father raised him alone. Though at the age of five his father, a scientist, died in an accident. During an experiment gone wrong it put the lab on fire and his father was stuck inside without a way out. Unable to bring him and the smoke and fire making him unable to find his way out on his own it was too late once they finally found him.
Despite it all he continued to live. Orphaned and running away from the area. Not that he had anywhere to go. For a young child as him he did not think that far ahead and soon enough found himself out near a more secluded part of the colony where he was able to find a spot that would provide him with a good enough spot to live. Ever so often finding his way into town to find food. Upon one of these run into town he would run into major Pierce Looman, a robotics and computer scientist. Stationed out here to try and continue his studies as well as creating simulations. Wanting to perhaps be able to help out with all things in the military, as well as having his studies, if slightly obsessive, on the Cylons.
Even if he, as of yet, did not stay with the major at least he kept meeting with him. Soon enough however Pierce did find out about Luc truly being an orphan and took him under his wing. Helping to raise him and Luc seemed to be quite fine with it. Getting his hands on different simulations as well as enjoying to go on a swim out in the vast sea.
Teen years
As years continued to go on Luc started a liking for a special simulation. Perhaps being twelve or thirteen and having gotten his hands on a flight simulator. Enjoying it and learning from it. But mostly he enjoyed games and other simulators. Mainly those using large gunnery. Even in the combat flight simulators he always preferred the shooting over the actual flying, not that he did not enjoy flying. He enjoyed it both. Learning a lot from it and laying forth the ground work for his future profession.
Despite the unfortunate things he went through Luc was a happy child and also he enjoyed life to it's fullest, even if he could be a trouble maker at times. Swimming always being something that he enjoyed and he started more deepsea diving soon enough, learning to be a scuba diver on his free time. Learning about the ocean as he went along. Mostly it was that, time in simulations, spending time with Pierce to learn more of his profession or trouble making that took up his time.
All of this leading to Pierce telling Luc about Cylons as well. As well as about the name Lucifer. How it meant light-bringer. Which was how he saw the young man. Telling him about the story of a cylon with the same name as well though and how that was the wrong use of the name. Though wishing for Gabriel to right such a wrong using of the name. Soon after leading to Gabriel taking that on as his second name. Even making sure to do so legally. Even if most people had little idea for the reason behind the actual name.
Fleet Academy
As he came of age Pierce helped to get him into the colonial fleet to study to become an officer. Which later would lead him to going to flight school. Going away to study at the fleet academy of Caprica. Continuing his studies of oceanography, though making use of what he had learned over the years with Pierce, that about computer science that is. Still he mostly managed on his own while at the academy. Running a lot and trying his best not to get into trouble. School disciplining him but he still did learn a could of new things along the way. His new name would never really be fully used but he did call himself Luc. Going through school with decent enough grades and graduating. Though a lot of his time was trying to find time to continue those simulations that he had been doing for most of his life. Which did consist mostly of flight and gunnery things.
Though his time in school was not over after the fleet academy as he then continued to flight school in the same place. Already having a license. One that he got on his seventeenth birthday. Having always wanted to be a pilot and he did put up the effort even when on Aquaria. So he did not need to spend his time learning that from scratch. Continuing his education and also around this time running into a certain person. Maia Cara Kane.
Flight School
Skilled viper pilot but perhaps a bit of an ass at times. That might be how most could describe Luc as he was perhaps the top of his class as a viper pilot. Not holding back on enjoying to brag and show off either. Though the characteristics kept him getting into arguements, if playful, with Maia. Continuing what might be an awkward fued that is perhaps way too commonly seen in comedies. Even if finally the end results would be the same, but getting to that later. Continuing to flirt and tease each other throughout fligth school though.
How quickly he picked it all up is perhaps not odd seeing as most of his days were spent in simulators, and at sixteen he had been flying real planes for training and getting his license at seventeen. But the gunnary part being the main as he spent most time in the simulator doing that and it handled similar enough to the real thing that he managed well. Also, all his bragging and showboating did not fully mean that he was some kind of jock or similar. As he actually had geeky sides. Such as being a gamer and pretty much being an encyclopedia of media. However with the sea of things to get a callsign from he got his from his obsession with always having to do something with his mouth. Be it to chew on something or just have something there. Or just talking and by one photo there was of him. There by earning him the callsign Crater.
Maia and Orion
All through Flight school his relationship with Maia was quite interesting. When it came to their training in piloting, gunnery, firearms they were very competitive, each always trying to top the other. They spent so much time together in training and in real life. He also liked taking her to do odd things and Zorbing was one of them. Maia took a belly dancing course on a dare from him and Luc took break dancing on a dare from her. They rented movie after movie, spending time together at every available opportunity, talking about everything they could imagine. She trained him some in martial arts, just the basics mostly but she could still pin him about every time they play wrestled.
As things continued so did he and Maia. Though getting closer to each other. It wouldn't take long before it turned out that Maia was pregnant and Luc proposed. Getting married and happy for a moment. Learning a lot from each other. The personality of Maia being one that he always liked. They learned a lot together and she even helped him become better with his melee skills. Fighting though mostly for fun.
Though soon it was known that there was miscarriage and both being impulsive and emotional people it just all started turning south. Having a hard time back and forth until they finally seperated. Continuing living and so on. And when opportunity came to leave, he took it. Going with Orion. Passing the tests and all. Meeting Maia again there it would seem.
As for his own professional career he was continuing to keep his skills to a high level and for some time being stationed at a base. But after his seperation with Maia he did try and do what he could do learn and become better. Both as a pilot and an officer.