Well, perhaps he uses his magic skills. He could cast protective spells around the Starks' territory, like a powerful Fidelius Charm to keep their location secret from their enemies.
It could be the White Walkers if this is a crossover fanfic set in the Game of Thrones universe. They are a huge threat to the Starks in their own world, and Harry Potter would have to find a way to stop them.
In fanfic, 'Team 7 protects Harry Potter' could mean that a group named Team 7 takes on the role of safeguarding Harry. This might be a new take on the story where an original group, perhaps created by the fanfic author, uses their unique skills and relationships to keep Harry out of danger. Maybe they are a group of students with special abilities or a secret organization within Hogwarts.
Another plotline might be that there is a prophecy in the Harry Potter world that only a foreign hero can save Harry. Naruto arrives just in time. He has to learn about the wizarding world quickly while also fending off attacks from the dark side. He could use his shadow clone jutsu to confuse enemies and keep Harry safe.
In fanfiction, Harry Potter could protect the Starks by using his magic skills. For example, he could cast protective spells around their territory to keep away enemies. His ability to apparate could also be useful in quickly getting the Starks out of dangerous situations.
Well, perhaps Harry uses his magic skills like the Shield Charm to protect Colin from various dark spells or dangerous creatures. For example, if there are Death Eaters around, Harry could quickly cast a Protego Maxima to form a large protective shield around Colin.
I'm not sure about specific 'naruto protects harry potter fanfic' stories off the top of my head. But you can try searching on some popular fanfic websites like Archive of Our Own. They usually have a wide range of crossover fanfics.
In the fanfic, the main challenges for Harry could be related to the limited time he has. He has his own studies and tasks to attend to, like preparing for exams or dealing with the mysteries of the Chamber of Secrets. Yet, he still has to find time to protect Colin. Also, the magical environment itself can pose challenges. There could be spells that are difficult to counteract while protecting Colin, especially if they are new or dark magic.
Yes, it could be. Hogwarts is a very important place in the Harry Potter world, and Harry Potter is the main hero. So it makes sense that protecting Hogwarts by Harry is a popular theme.
One common theme is redemption. Slytherins are often seen as the 'bad guys' in the original series, so protecting Harry gives them a chance at redemption. For example, they might be trying to make up for past wrongs or the actions of other Slytherins.