The theme of second chances is quite prevalent. Fem Harry is basically giving her younger self a second chance at a better life. There's also the theme of identity. The younger self may struggle with their identity, especially if they are in a different situation than Fem Harry originally was. For example, if the alternate world has different social norms. And the theme of friendship often comes into play. As Fem Harry and her younger self interact with other characters, new friendships are formed, and old ones may be tested. All these themes work together to create an interesting and complex fanfiction story.
Well, often the story starts with Fem Harry finding this alternate younger self in a strange situation. Maybe it's due to some time - travel or parallel universe stuff. She then takes on the role of a protector. She has to teach her younger self all the things she learned the hard way, like magic skills and how to deal with the wizarding world's politics. There could be a lot of emotional moments as she sees her own past self struggle and tries to make it easier for her. And of course, there would be interactions with other characters who are either confused by this new situation or try to help Fem Harry in her mission of raising her younger self.
Well, there are fanfictions where Harry raises his younger self after a time - travel incident. He has to protect his younger self from the threats he already faced, but also tries to give his younger self a more carefree childhood. This often involves him using his skills and connections in the wizarding world to keep his younger self out of danger while still allowing him to learn and grow in a different way than he originally did.
It shows how Harry, having gone through so much, can influence his own past self's development. He can pass on wisdom and skills, which changes the younger Harry's path.
One aspect could be Naruto training his younger self to be a better shinobi. He'd share his battle experiences, like the fights against Haku and Zabuza. His younger self would learn from his future self's strategies and become a more formidable ninja at a younger age. Also, Naruto could help his younger self understand the power of the Nine - Tails in a more positive way, instead of just seeing it as a curse. This could lead to his younger self being more confident and in control of his abilities much sooner.
One interesting self - insert raise could be a character who is inserted into Hogwarts as a new student with a unique magical ability not seen before in the series. This could change the dynamics of existing relationships and storylines, like how they interact with Harry, Hermione, and Ron.
One idea could be that Fem Harry Potter, with her unique perspective from another time, tries to raise Tom Riddle with a sense of love and family that he lacked in his original upbringing. Maybe she uses her knowledge of the future to guide him away from the dark path. For example, she could introduce him to different magical cultures early on to broaden his view.
Draco Malfoy is also a popular choice. The contrast between his initially haughty and sometimes mean - spirited nature and the fem self's character can lead to some really intense and evolving relationships in the fanfiction. It could start as a rivalry and turn into something more.
One popular 'Harry raises self' fanfic could be 'A Different Path'. In this fanfic, Harry often has to rely on his own wits and the knowledge he has gained from his difficult past to navigate through new challenges. It shows his growth as he essentially raises himself.
She would probably start by teaching Teddy basic magic at home, like how to make a feather float or how to use a simple charm. Since she has her own experiences at Hogwarts, she'd know what's important for a young wizard to learn early on.