It could be really wild. Maybe Harry Potter gets transported to a world where he has to take on the role of Red Hood. He could use his magic in ways that Red Hood uses his skills, like using magic to track down villains instead of normal detective skills. And his Hogwarts friends could be reimagined as characters in the Red Hood's story, for example, Hermione could be his sidekick, helping him with research and strategies.
I'm not sure if there is such specific fanfiction directly stating 'Harry Potter is Red Hood'. Fanfiction can be quite diverse and spread across many platforms. You could start by checking large fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. However, it might be a very niche or rare combination, so it may not be easy to find.
One way it could work is by having Little Red Riding Hood be a new student at Hogwarts. Maybe she has a magical red cloak that has special powers, like it can turn invisible when she's in the Forbidden Forest. She could be sorted into Gryffindor for her courage in facing the Big Bad Wolf, which could be seen as similar to facing dark wizards.
It could be a symbol of mystery. Harry is often in the center of many important events. The hood adds an air of mystery to his character, making others wonder what he's up to or what he's hiding. For example, when he's sneaking around Hogwarts at night, the hood might make it harder for Filch or other nosy people to recognize him.
Yes, there are. You can find some on popular fanfiction websites. Just search for 'Red Riding Hood x Harry Potter' and you'll get a list. Some might blend the magical world of Harry Potter with the fairy - tale elements of Red Riding Hood in really creative ways.
She might be a half - blood. Her Muggle side could come from her family in the Muggle world where the Little Red Riding Hood story originated, and her magical side could be discovered when she starts showing signs of magic like making the flowers in the forest grow faster with a wave of her hand. She could attend Hogwarts and become friends with Harry, Ron, and Hermione.
One common theme is the clash of different magical worlds. Red Riding Hood's more traditional fairy - tale magic against the complex magic system in Harry Potter. Another could be the idea of a new character (Red Riding Hood) disrupting the status quo at Hogwarts.
His motivation could be related to a difference in ideology. Red Hood has a more brutal approach to crime - fighting compared to Nightwing. He might think that Nightwing's methods are too soft and by kidnapping him, he wants to force Nightwing to see things his way.
One idea could be that Red Riding Hood is a new student at Hogwarts. She could be sorted into Gryffindor because of her courage in facing the Big Bad Wolf. And she might bring some of her own magic from her fairy - tale world, like her red cloak having special protective powers at Hogwarts.
Harry could teach Red Riding Hood some basic spells. For example, he could show her how to use the Lumos charm so she can see better in the dark forests.