As with every notable family, especially those of the Sacred Twenty-Eight title, there would be multiple branches and some of those branches would just so happen to break the stereotype of said family name. Aragon Rosier, someone within the Rosier family who showed great potential for the Dark Arts, was such exception. As a man who didn't quite share his family's enthusiasm for the dark arts or marriages into the Black, Lestrange or Malfoy families, he broke away as soon as he could and became a vigilante of sorts - helping those who needed their vengeance acted upon. Naturally it created a rift between Aragon and his family but he persevered further, aiming to have a clearer conscience and sense of morals than his family.
Though the Rosier family largely ignored Aragon, the tensions with him flared up again upon his decision to marry a Longbottom - the same family that were the targets of one of the Rosier's martial lines, the Lestrange's. The extra salt in the wound was how outspoken Aragon's wife, Georgiana, was about the whole ordeal. In fact, the couple themselves were targeted a few times and only found peace by integrating into the muggle society. Jobs came in here and there but, for the most part, Aragon and Georgiana had devoted themselves to a life of secrecy in the form of muggle-ness. From the time they were in their mid-twenties till their deaths, the two acted more like muggles. They lived in a muggle neighbourhood and their sons, Rewan and Tomas, attended muggle school - that was until they were eleven respectively and were accepted and subsequently attended Hogwarts. Up until that point, the Rosier's vigilante jobs had died down but the introduction of their sons to the magical world revitalised them and, in the wake of the wizarding war, more people were needed to be taken care of.
It was at Hogwarts in his seventh and final year that the Ravenclaw Rewan truly met Elizabeth Montgomery, a pure-blooded member of the Gryffindor house. They'd spoken a few times throughout their time at Hogwarts but had never truly committed to a full-blown conversation and thus had an animosity between them. What had started as a small bumping into at Hogsmeade at the beginning of the year turned into a full-blown, committed relationship. The two went from never being associated to one another to being synonymous together. It was this bond the two shared, paired with their desire to enact justice, that the two married soon after leaving Hogwarts and essentially picked up where Aragon and Georgiana left off - allowing Rewan's parents to retire once again.
Rewan and Elizabeth put off having children until they had made a small fortune for themselves and could settle with not having to take jobs as often; leaving that part to Tomas who had joined the family business a little later. Perhaps unexpectedly, Rewan and Elizabeth ended up having a slew of children, contrary to the belief that they'd have a couple at a push. First was Belladonna, then Jackal, then twins Wynn and Brynn followed. Endelyn broke the chain of three boys but Aryan and Sylas picked up where their elder brothers had left off. The eighth and final child, daughter Eloise, rounded up the Rosier children.
Growing up, Eloise was always the different Rosier child, standing out amongst her brothers and sisters. It was never in a quirky way that was endearing, but ways that scared her parents. You see, Eloise had an obsession with what her uncle did; wanting to know why he had to go unannounced at times and even why she found in her own home notebooks that detailed what different spells did to people. No matter how hard they tried, Rewan and Elizabeth couldn't stomp out their daughter's interest in the vigilance that her uncle partook in, even more so when he told her he was fighting the bad guys and was making the world a better place. That in itself made Eloise all the more determined that she, one day, would be just like him. That was one of the abnormalities Eloise had exhibited, the one that her parents found it difficult to confront.
The other abnormality that made her stand out amongst her siblings was the fact that she a lot more bashful and, well, boyish than any of her sisters had before her. Her parents paid little to no mind; with five elder brothers it seemed obvious that Eloise would be perhaps more masculine than feminine in her earlier years. The only difference was, whilst her sisters Belladonna and Endelyn enjoyed the more traditionally feminine things like pink and dresses, Eloise strayed away from them and, in her earlier years, wouldn't be seen without a pair of mini khaki shorts on. Aside from that though, Eloise was as ordinary as a little girl could be; she attended her muggle primary school, was always decently behaved and never shied from being a bit rough when it came to exploring.
Things truly changed for Eloise at her first magical experience when she was seven-years-old. The first, and perhaps the most trivial, was the change she saw in how her parents reacted when the glass of the greenhouse shattered around her. Since her parents had, at first, assumed she had thrown a rock at the walls they were infuriated but, upon further inspection, they realised it was the doing of her magical prowess and calmed down. This introduced the change in Eloise's life in which she was finally able to be involved in the magical things that were kept secret from her. An ever mature child, Eloise took the chance, in a time where her parents were being honest with her, to be be honest with them and revealed to them that she saw herself more as a boy rather than a girl. Her parents had no qualms accepting it - having been friends with a transgender male at school that Eloise used as an example - but wanted to know the origins. Eloise explained to them that she had always felt that way but never knew how to explain it, nor did she know how to tell her parents - in fact she'd only found the confidence when she heard her mother explain to one of her brothers what it meant when they had asked and she felt a strange resonance with it. Looking back on it now, there's an infinite gratitude for Rewan and Elizabeth being accepting and supporting of it.
The continuation of changes occurred even after that night. With the help of his parents, Eloise had ditched the old identity in lieu of a new name; Harley. His parents also helped him combat any body dysphoria; doing all they could on the medical side to allow him to undergo any surgeries or hormone intakes whenever earliest whilst still being safe. Harley felt a lot happier living with the identity chosen and, now being able to be included into all the magical talks his parents had with his siblings, he felt like a fully committed member of the Rosier family. The one thing that Rewan and Elizabeth couldn't shake, however, was his dream to join his uncle in becoming a vigilante of sorts. No matter how hard his parents tried, nudging him to look at the various ministry jobs to see if one appealed to his near adolescent mind, he would never relent and the two began to fear for the worse.
Harley kept his dream even until Hogwarts, where he currently is now. In fact, he's been given a small task by his uncle and parents to oversee; should he complete it, he can join the life once leaving Hogwarts and Gryffindor house but, if he fails, then he's committed to a promise to look elsewhere.