Well, Draco may hate his father because his father's actions always put him in dangerous situations. For example, in the fight against the good side, Lucius was very eager to prove his loyalty to Voldemort by using Draco in some dangerous missions. Draco, on the other hand, might not be as fully committed to the Dark Lord as his father, and this disparity in their beliefs and the way his father endangered him could lead to hatred.
One possible reason could be his father's strict and cold parenting style. Lucius Malfoy was often very controlling, pushing Draco to uphold the family's pure - blood ideals and reputation, which might have made Draco feel suffocated and resentful. Another reason could be that Draco witnessed his father's dark deeds in the wizarding world, like being involved with Voldemort, and he might have moral objections to such actions.
In such a fanfiction, Draco's character development could start from his initial hatred, which might be a sign of his first step towards independence. He begins to question his father's authority and the values he was brought up with. This makes him more complex as a character.
Perhaps Draco is tired of living in his father's shadow. His father has always been a dominant figure in his life, and by killing him, Draco could be trying to assert his own identity.
One possible reason could be that Naruto feels abandoned. His father was not around during his childhood, and he had to face a lot of hardships alone. Growing up without a father figure, he might have developed resentment.
One reason could be for a disguise. Maybe he's on a secret mission and needs to pass as someone else. Another could be peer pressure. His friends might have dared him to do it.
One possible reason could be jealousy. Maybe his brother has some special abilities or gets more attention that Naruto feels he should have. For example, if his brother is really good at a certain jutsu and is always praised for it while Naruto struggles, that could lead to resentment.
One possible reason could be their long - standing rivalry. Draco has been taught to dislike Harry from a young age due to their family differences. His pure - blood supremacist upbringing might make him reject Harry as a mate because Harry is seen as a 'Mudblood - lover' in the eyes of Draco's family and their circle. Another reason could be fear. Draco might be afraid of what the wizarding society would think if he accepted Harry as his mate. The wizarding world has its own set of norms and expectations, and a relationship between them would be highly unconventional and likely face a lot of opposition.
Often, Draco as a father in fanfiction can be shown as having a special bond with his child. He might have a unique way of showing his love, like through gifting rare magical items or taking his child on secret adventures in the wizarding world that only they know about.
One possible reason could be the way the Dursleys treated him. They were cruel, made him live in a cupboard, and constantly belittled him. This kind of mistreatment over the years could easily lead to hatred. Another aspect could be the lack of connection to his wizarding family that he was not aware of for a long time. He might feel angry at his parents for leaving him in such a situation without any real protection from the Dursleys.
One possible reason could be that he might feel abandoned. Growing up without them, he could resent the fact that they left him an orphan. He might think that if they were really so great, they would have found a way to survive and be there for him.
Maybe he wants to rebel against his family's traditional image. In the wizarding world, the Malfoy family has a certain 'pure - blood' and proper image. Dyeing his hair could be a way for Draco to show his individuality and break free from the constraints his family has put on him.