His relationships would likely be very different. For one, he might be more of an outsider. The other students grew up in the wizarding world in a more common way, while Harry was raised by the Flamels. He could be seen as having an unfair advantage in terms of magic knowledge. But on the other hand, he might also be respected more for his unique upbringing.
A wife and mother is often the main support in her sons' stories. She provides emotional support, like being there when they are sad or frustrated. For example, if a son fails an exam, she will comfort him and encourage him to try again.
Another reason could be boredom. If her life has become monotonous and there's no excitement in her relationship, she might look for it outside. But these are just fictional reasons and not an excuse for real - life unethical behavior.
Imagine a village where there is a yearly tradition. A large, beautifully decorated pole is used to carry a statue of the village's patron saint. The villagers take turns carrying this pole in a grand procession through the village. Along the way, they sing traditional songs and tell stories about the saint, and this event brings the whole community together in celebration and unity.
Another possibility is that a mysterious character in the fanfiction world, who has a soft spot for the girl, finds her lost glasses. He then uses this as a clue to track down where she has been taken. Along the way, he discovers more about the girl's situation and the reasons behind her kidnapping.
The popularity of Arthur Dayne OC fanfiction lies in the character of Arthur Dayne himself. He is a very interesting and mysterious figure in the original lore. People are attracted to the idea of creating their own characters to interact with him.
Some might think that a WWE superstar like The Undertaker could be the most powerful. His in - ring presence is so intimidating. If he were to somehow gain some magic abilities, like being able to control the dark elements similar to some dark wizards in Harry Potter, he could be truly unstoppable. He already has a reputation for being 'undead' in the WWE, which could be enhanced with some dark magic elements from the Harry Potter world.