What could be the possible motives for a man who killed his wife and 2 daughters?

One possible motive could be jealousy. Maybe the sister is jealous of Naruto's popularity, his strength, or the attention he gets from others in the village.

Well, it could be for the sake of exploring a different kind of magic or a different set of rules in the wizarding world. Perhaps in this fanfiction's version, the parents were under some sort of dark magic influence that made them turn on Harry. Or it could be a psychological exploration. The writer might be interested in delving into the minds of Harry's parents and seeing what could make them do such a heinous act. It could also be just a very different take on the concept of family and love in the 'Harry Potter' universe.

One possible motive could be to reignite the passion in their relationship. Over time, the spark can fade, and a wife might seduce her husband to bring back that excitement. For example, if they have been married for years and fallen into a routine.

There was a fantasy novel called " Evolving from a Wolf's Devour " in which one was killed by one's wife and then reborn. This novel was about the main character, Tangning, who was killed by her wife on her wedding night and was reborn as a bloodthirsty wolf. From then on, she embarked on a path of slaughter. This novel might meet your needs for a rebirth novel about being killed by your wife.

Well, in a fictional and very dark context, it could potentially be about revenge. If a woman has been severely wronged by a man in the story, perhaps in an extreme and misogynistic way, she might be depicted as taking this drastic measure out of extreme anger and a desire to cause the ultimate harm. But this is a very disturbing and unethical concept.

One possible motive could be robbery. He might be planning to use the knife to threaten the occupants of the house and steal their valuables.

It could also be a case of misinformation in the fanfic. Adrien might think Ladybug has turned evil or is about to cause great harm. So, in his attempt to save the city or his loved ones, he makes the tragic decision to kill her, believing it's for the greater good.

One possible motive could be that Dumbledore saw a future where Harry's parents' deaths were necessary for a greater good. Maybe he knew that Harry would be the only one to defeat Voldemort in the end, and their deaths were a catalyst to set Harry on that path.

Perhaps revenge is his motive. Maybe someone wronged him or his loved ones in the past, and he became a hit man as a way to get back at those who he holds responsible. He could be targeting specific individuals or groups related to the initial wrong - doing.

One possible motive could be revenge. Another character might have a grudge against Lucy for something she did in the fictional world, like betraying a group or stealing something precious.