Well, in fanfiction, Harry could resemble Lily in his overall appearance. His face might have the same softness. For example, his cheekbones could be as high and defined as Lily's. Also, his expression sometimes might mirror Lily's, like having a gentle and kind look in his eyes. His skin tone could also be similar, having that fair complexion that Lily was known for.
It could be really strange. Maybe Harry Potter would have some of Enkidu's characteristics, like being more in tune with nature in a way that wizards in the Potterverse aren't. For example, he could communicate with magical beasts in a more primal way.
A 'harry potter is a cowboy fanfiction' could be really wild. Picture Hogwarts as a big ranch in the middle of a prairie. The houses could be different barns or areas on the ranch. Spells could be used for things like herding magical cattle or protecting the ranch from dark wizards who are like bandits. The characters would have to learn both cowboy skills and magic, and there would be a whole new set of adventures and challenges for them.
Well, it could be really interesting. Maybe Harry discovers he has the ability to bend water like in the Avatar world. He could use it to his advantage during his battles at Hogwarts, creating water shields or using water to disarm his opponents in a very unique way.
In this fanfiction, we could see the Hogwarts castle being a place where Shazam - like powers are studied. The teachers might be trying to understand how these powers work alongside magic. For instance, Ron could accidentally get some of Shazam's powers and have to deal with the chaos that ensues. The story could also involve the villains from both worlds, like Voldemort teaming up with some of Shazam's enemies, creating a really complex and exciting plot.
If Harry Potter was raised by fanfiction, he could end up in a completely different Hogwarts. The fanfiction might rewrite the rules of the school, so he could be part of a new house system or have different classes. His friendships might also be altered. For example, he could be closer to some minor characters from the original series, and they could go on adventures that are more in line with the wild ideas often found in fanfiction.
In a 'Harry Potter is a Mandalorian fanfiction', we could see Harry Potter wearing Mandalorian armor while still being able to use his magic. He could be on a quest similar to the Mandalorian's, like protecting a youngling. The story could blend the magical elements of Harry Potter, like potions and spells, with the technological and action - packed world of The Mandalorian. For example, Harry could use a spell to enhance the Mandalorian's blaster or use a potion to heal an injured alien. There would be a lot of potential for character development as Harry adapts to this new and very different universe.
A 'harry potter is a xenomorph fanfiction' could involve the Xenomorphs infiltrating the wizarding world. The Ministry of Magic would have to deal with this new threat. Harry and his friends could be on a quest to find a way to stop the Xenomorphs from spreading, perhaps using some ancient magic that has been long forgotten. There could be a lot of action and suspense as the wizards try to understand the alien biology and weaknesses while the Xenomorphs keep attacking. The story could also explore how the different houses in Hogwarts cooperate or compete in this crisis situation.
It might have Harry Potter somehow transported to the Star Wars universe where he encounters General Grievous. Maybe Harry would try to use his magic against Grievous' combat skills and robotic enhancements. For instance, he could cast spells like 'Stupefy' to try and stun Grievous, while Grievous would use his lightsaber skills and agility to counter. The story could also involve Harry trying to find a way back to his own world, all while dealing with the various threats and politics of the Star Wars universe.