Harry's life would be turned upside down. Firstly, he'd be in a much more affluent family. But he'd also be in a family with a lot of dark secrets. He'd have to navigate the Malfoy family politics, which would be a far cry from his time at Hogwarts. He might also receive a different type of magical education, perhaps one more focused on the dark arts (initially at least), which would put him in a moral dilemma.
His life would change drastically. He'd be living in a different environment, with different values being pushed on him. Instead of the Dursleys' neglect, he'd face Lucius's attempts to mold him into a pure - blood - ideal wizard.
Lucius may become more conflicted. He starts off as a loyal Death Eater, but having Harry in his care makes him question his loyalty to Voldemort. He might start to see the humanity in Harry and that could soften his cold - hearted nature. For example, he may find himself protecting Harry from other Death Eaters.
He becomes more conflicted. Growing up as Lucius Malfoy's son, he is exposed to different values. So, instead of the Gryffindor - like straightforwardness, he may have a more calculating side.
Well, in some fanfictions, Harry might use his advanced magic skills he learned from Dumbledore's old books. Maybe he discovers a long - forgotten spell that can reverse the dark magic effects on Lucius.
In such a fanfiction scenario, Harry might be exposed to a very different upbringing. Lucius could try to indoctrinate Harry with pure - blood supremacist ideas at first. But as time goes on, Harry's strong sense of justice might conflict with Lucius's beliefs. Maybe Harry would gradually change Lucius's view on Muggle - borns, or he could use his influence within the Malfoy family to bring about some positive changes in the wizarding world's view on blood purity.
In some fanfictions, Lucius Malfoy might save Harry Potter out of a change of heart. Maybe he realizes the greater evil that Voldemort represents and decides that Harry is the key to stopping it. So he could use his position within the Death Eaters to provide crucial information to Harry or his allies.
Well, if Harry was Lucius Malfoy's son, it would completely flip the story. Harry would be brought up in a pure - blood supremacist family. He might not have his kind heart as we know it. His relationship with Ron and Hermione would be non - existent or very different. He would probably be taught dark magic from a young age instead of the values he learned at Hogwarts in the original story.
Many 'Harry Potter Lucius Malfoy Mpreg Fanfiction' stories also explore his relationships in a new light. His relationship with his family, especially Narcissa, could be strained or strengthened. And his relationship with other Death Eaters or Hogwarts faculty might change as they react to his unexpected condition.
His personality might become more reserved. Growing up in the Malfoy household, he'd be surrounded by Slytherin values. So he could be more calculating and less impulsive compared to his original self. But he would still have that core of kindness from his parents.
Sure, there probably is. Fanfiction allows for all kinds of wild ideas. Writers might be interested in exploring a relationship between Harry and Lucius to add a new layer of complexity to the story. They could be looking at how the two characters from opposing sides could interact in a different way than what's shown in the original books. But it's important to note that this goes against the normal portrayal of their enmity in the official series.
Some fanfictions explore a more complex relationship. Maybe Lucius has a secret prophecy about Harry that makes him act in strange ways towards him. He might be torn between his loyalty to Voldemort and this new - found interest in Harry, which causes a lot of internal conflict and very different interactions with Harry compared to the original books.