Hermione's parents could potentially be Harry's guardians in such a fanfic. They are Muggles, but they are kind and intelligent people. Given Hermione's close friendship with Harry, they might take him in and protect him. Also, they have experience raising a child, which is Hermione, so they could offer a stable home environment for Harry.
The Weasley family could also be a candidate. They have a big family full of love. Molly Weasley is very motherly and has always been fond of Harry. Arthur Weasley is a kind and just man. Harry has spent a lot of time with the Weasleys and they could easily become his guardians in this alternate fanfic scenario.
In some fanfics, Sirius Black could be an alternative guardian for Harry. Since Sirius was Harry's godfather, he had a strong claim to guardianship.
Perhaps Sirius Black could be Harry's magical guardian instead. In the original story, Sirius had a strong connection to Harry and a great desire to protect him. Even though Dumbledore was a major figure in Harry's life, Sirius was his godfather and had a natural claim to the role of guardian.
One possible reason could be that Dumbledore wants Harry to have a more normal upbringing away from the spotlight of Hogwarts and his own influence. So he deliberately steps back from the role of guardian.
One reason could be that Dumbledore had too many other responsibilities in the wizarding world. He was the headmaster of Hogwarts and was constantly involved in dealing with the threat of Voldemort on a larger scale. He might not have been able to give Harry the individual attention and care that a true guardian should provide.
Dumbledore, as Harry's guardian in the fanfiction, would probably use his influence in the wizarding world. He could make sure that Harry is taught by the best teachers at Hogwarts. He'd also be there to offer advice and guidance, especially when Harry faces challenges like dealing with Voldemort or other dark forces. For example, he might teach Harry some advanced defensive magic privately to better protect himself.
Yes, there could be such fanfics out there. Fanfic writers often explore unique relationships and scenarios. They might rewrite the story to have Snape in this unexpected role, adding new layers of drama and emotion to the Harry Potter universe.
In fanfic, Snape as Harry's guardian can be a source of great character development for both. Snape, having his own past traumas and secrets, may see a bit of himself in Harry. He could use his position to teach Harry about the importance of controlling emotions, especially anger which both of them struggle with. This can lead to some heart - to - heart moments between them, where Harry starts to understand Snape's motives better and Snape, in turn, realizes he has more to offer as a guardian than just discipline.
McGonagall as a guardian might also involve her protecting Harry from the darker forces in the wizarding world more directly. Instead of just being a teacher, she could be the one to shield him from certain Death Eaters or threats. She could use her Animagus form to secretly follow Harry when he's out of Hogwarts and make sure he's safe.
They probably have a very close relationship. Dumbledore would be like a father figure to Harry, guiding him through the wizarding world.
Sakura could be a great guardian in a 'naruto guardian fanfic'. She has strong medical skills and combat abilities. She could use her medical ninjutsu to heal Naruto when he is injured in battles and also fight alongside him, protecting him from harm.
It could be his mother, Lily. Her love was already a powerful protection for Harry, so in the fanfiction, it could be her spirit acting as a guardian angel, using her love to shield him from harm in a more direct and continuous way.