Everyone has their own headcanons for their class's backstory. I wanted to make sure the one I'm thinking of for my SW makes sense, lorewise. Let me know what you think, and feel free to post your character's backstory as well. Here's mine:
The SW was born to wealthy human Sith on a small Imperial world. His parents had tried for years to conceive an heir, and finally had one. Unfortunately, the SW was tested at birth and deemed not to be Force-sensitive; he wouldn't be Sith. The authorities wanted the boy to be sold into slavery as many non Force-sensitive children are, but his parents had the clout to avoid that. After all, a mundane heir was better than none at all. He may never hold land or title, or even rule over others, but at least he would pass on the bloodline.
So the SW was raised in a Sith home, given the best education, living a comfortable life, and seeing the best the Empire had to offer. His parents were never able to produce another child, so the SW remained the only scion of his family. And though his father never got over the disappointment of having a mundane child, his mother still insisted there was strength in him, and that anyone can harness their emotions to grow stronger.
As the boy grew into a man, he moved from position to position within the bureaucracy of the Empire, landing a position and rising through the ranks of the Sphere of Laws and Justice, as good a life as one without the Force could have in the Empire, though forever barred from the highest levels of power. And despite his successes, the SW always yearned for more.
One day, while the SW was staying with his family at their estate, a coalition of rival Sith lords led an unsanctioned attack on them. The word had been sufficiently spread that there was no Sith heir to their lands, and knowing this, power hungry Sith sought the death of the SW's parents so that their lands could be divided among the coalition. The SW fought alongside his family's troops; though not a Sith he had been trained to fight. However, he was no match for the Sith that attacked his home.
During the battle, his father was struck down. The SW was angry, but still helpless. However, shortly after, his mother was killed. When this happened, something awakened within the SW. His mind flooded with scattered visions, and his body coursed with an unfamiliar power, as if a dam had been opened. Howling in pain and rage, the SW released an explosion of pure Force energy that killed most of the attackers; snapping their necks, crushing their hearts, frying their minds.
The Imperial Military intervened in the attack, arrested the surviving Sith attackers, as well as the weakened SW. While in custody, awaiting trial (he would either be executed as a threat or forced to be Sith), the SW slowly was able to grasp fragments of the visions in his head, and he came to understand what had happened. Though his father had wanted a true Sith heir more than anything, his mother had known that the SW was their only chance at a child. She did not want to risk the almost certain early and painful death of Sith hopefuls, so she severed his connection to the Force before he could be tested. When she died, the connection immediately re-established, and a lifetime of repressed Force energy overwhelmed the SW, resulting in the horrific explosion that nearly killed him.
Word of this remarkable occurrence reached an influential Overseer at the Korriban Academy. A pure human Sith with unparalleled power in the Force, untrained and yet strong. The Overseer took a risk and had the SW brought to Korriban. Though essentially untrained in the ways of the Sith, the SW offered a remarkable power and genetic purity, both of which led the Overseer to hope he could force the SW through training early and overcome the threat of tainted blood. And, though understanding of his mother's actions, with his family dead and his powers revealed, the SW now seeks the heights of power to reclaim his family's lands and serve the glory of the Empire.
So, is there anything lore-breakingly inaccurate about that story? Thanks for taking the time to read this!