Iruka Sensei could also be a potential guardian. He was Naruto's first teacher and has always cared about him. In a fanfic, he could take on a more active role in protecting Naruto, perhaps using his knowledge of the village and its secrets to keep Naruto out of dangerous situations.
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.
Another possibility is Kakashi. He is one of Naruto's mentors. In a 'naruto guardian fanfic', he could be like a shadow guardian, always watching over Naruto from a distance. He has a lot of combat experience and unique jutsus, which he could use to defend Naruto when necessary. He could also offer Naruto valuable advice on how to grow stronger and face his enemies.
A potential guardian could be Sirius Black's spirit. Even though he died, his love for Harry could be so strong that it allows his spirit to act as a guardian. He could appear to Harry in times of need, give him advice, and even use his limited spectral powers to protect Harry from minor threats.
Hermione could be a great magical guardian in fanfiction. She's smart and resourceful. With her vast knowledge of magic, she could protect Harry in many ways, like using her spell - casting skills to fend off dark wizards.
Well, Naruto himself could be one of the main characters. Since it's a Naruto fanfic, he is likely to be involved. And of course, the silent guardian would be a main character too. Maybe it's a new character created specifically for this fanfic, someone with a mysterious past and a strong sense of duty.
In this 'naruto fairy guardian fanfic', Naruto would be a given as a main character. He might be joined by some of the other Konoha 11 members. For instance, Shikamaru could be a main character too. His intelligence would be very useful in strategizing to protect the fairies. Ino might also be involved, using her mind - related abilities to communicate with the fairies or detect threats. And of course, Kakashi could be a guiding figure for them in their new roles as fairy guardians, even if he's not as much in the forefront as the younger characters.
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.
It could be Orochimaru. He's always been after power and new jutsu. If Naruto is guarding something really valuable, like a new powerful ninja technique, Orochimaru would be a likely antagonist. He'd stop at nothing to get his hands on it.
A 'Silent Guardian Naruto Fanfic' might focus on a new character who acts as a silent guardian. This character could be a ninja with stealth abilities that are off the charts. They might be silently watching over Naruto or his friends, intervening only when necessary to keep them out of harm's way. For example, they could be protecting Naruto from certain enemies who are trying to harm him while he is on his journey to become stronger.
Well, it could be that the 'naruto fairy guardian fanfic' has a plot where Naruto and his friends are somehow transported to a fairy - populated area. And there, they discover new powers related to being guardians of the fairies. They might face challenges like protecting the fairies from evil forces that want to use their magic for bad purposes. The story could also include elements of Naruto's normal ninja skills being combined with the fairy - like abilities they gain in this new world.
It could be an old demigod who has retired from active quests but still has a lot of knowledge and power. Maybe someone like Clarisse's older relative who has seen a lot in the demigod world and is now tasked with looking after Percy.