Claude was born to Anne and Sebastian Stuart on the afternoon of May first, 2016. A fairly short time later, her only sibling, Ernest, was born. Anne and Sebastian, despite being well-known lawyers in the magical world, specializing in the defense of part-humans, non-humans, and werewolves, were not the best parents. They we often very busy with their work and simply didn't have time for their children, choosing instead to put them in the care of nannies.
The nannies were...good enough. High-end, professionally trained, great with kids, but not parents, which is really all Claude wanted. That said, she wasn't a troublesome child, but she asked a lot of questions and liked to eavesdrop on conversations when she shouldn't. Admittedly, she didn't understand most of what she heard, but the time she spent eavesdropping on her parents helped her feel a bit closer to them.
Claude was sent to a muggle primary school before Hogwarts, where she was a fairly average student. Her grades were good, but nobody really did poorly and she didn't do anything to make herself stand out from the rest academically. Her least favorite subject was art - she didn't have any real desire to make art and didn't like having to do so either.
In fact, Claude's first sign of magic showed up in art class when she was eight. The teacher was trying to convince her to complete the assignment, and Claude wasn't having it...and suddenly, the teacher went silent, despite still trying to speak. Ministry obliviators were on the scene quickly to rectify the situation, and Claude was escorted home, where she received a brief reminder from her parents to keep her emotions in check going forward so there wouldn't be any more incidents. Shortly after, her parents left on a trip to Rome.
Or so they thought, anyway. Claude's incident at school had caused them to miss their train, so they'd organized a portkey to their connecting train in France so as not to delay their trip further, but something went terribly wrong with the portkey and instead of ending up in Gare du Nord, they ended up stranded in the middle of the Atlantic ocean, where they were caught by a terrible storm. Their bodies were found by American authorities some time later, and their death ruled a freak accident.
After the death of their parents, Claude and Ernest went to live with their cousins. It took Claude years to figure out if she missed her parents or if she missed the idea of them.
At Hogwarts, Claude was sorted into Gryffindor rather quickly, with the Sorting Hat only entertaining the idea of Ravenclaw for a few seconds. She excelled at Potions and Wizard Law, but did well in her other courses too. She loved volunteering for demonstrations in classes almost as much as she loved Quodpot club, especially when someone decided to add bludgers to the mix.
She graduated with high marks and absolutely no sense of where she wanted her life to go, so she said fuck it and spent the first few months after Hogwarts backpacking across Europe. Someone she met in a bar in Estonia suggested she try journalism, and Claude thought that sounded like a good idea. She liked keeping up with current events and she didn't believe things unless she could see them, so to speak...plus she had a real knack for getting into other people's business.
Claude boarded a plane in Oslo, Norway and flew to Boston in the United States where she attended Emerson College, majoring in Journalism. Was studying muggle journalism in a completely different country a bit of a culture shock? Yes. The biggest shock was the math courses which she was completely unprepared for, but thankfully she found a tutor majoring in Statistics at nearby Boston University to...help her out. With math.
They dated for three years. Claude finally told her about the whole...magic thing, and suddenly found herself very single. She supposed it was for the best, really...she'd totally been planning to go back home after school anyway. That wasn't a last minute decision at all.
Claude graduated Emerson with honors and a Bachelor's in Journalism, then moved back home and started looking for a job. Most of her friends were on her intramural soccer team, so they keep in touch, but beyond that, she wasn't really leaving much behind.