Voldemort, initially Tom Marvolo Riddle. His early life in the orphanage was marked by loneliness and a sense of superiority due to his magical abilities. Once at Hogwarts, he was drawn to the secrets of the Dark Arts. He had a fascination with the concept of immortality, which led him to create Horcruxes. His rise to power was filled with bloodshed. He formed the Death Eaters, a group of Dark wizards and witches who carried out his evil deeds. He targeted Harry Potter from the start because of a prophecy that said Harry could be his downfall. Throughout his life, he was consumed by his hatred for Muggles and those who opposed him. In the end, his overconfidence and the power of love and friendship that Harry represented led to his defeat.
One key event was his birth, born from a coerced relationship between his mother and a Muggle. Then, his time at Hogwarts where he learned about the Dark Arts. The creation of his Horcruxes was crucial. Also, the murder of the Potters which led to Harry becoming his nemesis. And finally, his defeat at the hands of Harry Potter.
Maybe it's a completely new character created for the fanfiction. This new character could be from a far - off land, with a different kind of magic that Voldemort is interested in. Their marriage could be a way for Voldemort to gain access to that new magic or territory.
Here's a different take. Voldemort could fall in love with a Muggle - born witch who has a special power. She might be a healer, with the ability to soothe even the darkest of souls. Voldemort, in his search for immortality, discovers her. At first, he wants to use her power, but as he spends time with her, he begins to feel something he's never felt before. He starts to protect her from other Death Eaters who might want to harm her for being Muggle - born.
Voldemort was born Tom Marvolo Riddle. His mother, Merope Gaunt, used a love potion on his father, Tom Riddle Sr. When the potion's effect wore off and his father abandoned them, his mother died soon after giving birth. Tom grew up in an orphanage. He was a very intelligent yet troubled child. He discovered his magical abilities early on and was able to manipulate those around him. His dark path began as he delved deeper into the Dark Arts at Hogwarts, influenced by his Slytherin heritage and his own thirst for power.
Tom Riddle, who would become Voldemort, was the product of a rather tragic and complex origin. His mother was from the Gaunt family, known for their inbreeding and instability. Merope's use of a love potion on Tom Riddle Sr. was a desperate act. At the orphanage, young Tom showed signs of his extraordinary magical abilities early on. His disdain for his Muggle father and his desire to rise above his humble beginnings, combined with his dark tendencies, set him on the path to transform into the feared Voldemort. He began to explore the Dark Arts, and as he grew older, he shed his identity as Tom Riddle and adopted the name Voldemort, a name that would strike fear into the hearts of the wizarding world.
In some fanfictions, Voldemort wins through a change in the prophecy's interpretation. If the prophecy was misread, it could give him an edge he didn't originally have.
Well, one possible scenario could be that Voldemort's marriage is a strategic alliance. Maybe he marries someone from a powerful dark magic family to strengthen his hold on the wizarding world. It could also be a very strange and tense relationship, full of power struggles and dark magic experiments within the household.
There is no traditional love story for Voldemort in the series. Voldemort is too obsessed with his dark goals. He values power above all else, and any relationships he has are more about control and subjugation. For example, his relationship with his Death Eaters is based on fear and loyalty through the use of the Dark Mark, not love.
Well, Voldemort was a very dark and evil character. A possible love story could be that he once met a witch who was also interested in the Dark Arts. They might have joined forces at first, and he felt some sort of connection to her as she was like - minded. But as time passed, his own megalomania grew and he saw her more as a tool than a love interest. Eventually, he either disposed of her or she left him when she realized how truly evil he had become.