In fem Harry is ancient xover fanfic, a prevalent theme is the clash of cultures. Fem Harry comes from a modern - day wizarding world in the Harry Potter series, and when she enters the ancient world, there are bound to be cultural differences. This can lead to interesting situations, like misunderstandings that she has to overcome. Another common theme is the exploration of gender roles. In the ancient world, gender roles might be more rigid compared to her own world, and fem Harry has to navigate through these expectations. Also, the theme of destiny often plays a part, as she may find that she has a special role to play in the ancient world she's been thrust into.
One popular fem Harry is ancient xover fanfic could be 'Fem Harry in the Ancient World'. It often has interesting plot twists where fem Harry uses her modern knowledge in an ancient setting. Another might be 'Fem Harry's Ancient Adventure' which focuses on her relationships and how she adapts to the ancient culture.
I'm not entirely sure if 'Harry is ancient xover fanfic' is a statement or a really oddly - phrased question. If it's a statement, it could mean that in a particular fan - created fictional universe, a character named Harry is part of an 'ancient xover' which might be a crossover with some very old or classic fictional elements. But without more context, it's hard to be more specific.
Sadly, I don't have any particular 'Harry is ancient xover fanfic' to recommend. Fanfics are a vast and diverse world, and this description is quite unique. It would be best to start by looking for fanfic communities or forums dedicated to the character Harry (if it's a known character like Harry Potter). There, you can ask fellow fans if they know of any stories that fit this 'ancient xover' concept. You might also want to be more specific about what you mean by 'ancient' - is it ancient civilizations, ancient magic, etc. This will help in your search.
It could be Hermione. Since she's Harry's close friend, she would likely play a significant role in a story where Harry is immortal. She might be the one trying to help Harry adjust to his new state or be involved in his adventures in some way.
In this fanfic, an interesting aspect could be how Harry deals with the passage of time. He might start to view historical events and future possibilities in a different light. His immortality could also attract the attention of powerful and ancient magical beings who either want to use his immortality for their own gain or fear the implications it has for the balance of power in the magical world. This could lead to a whole new set of adventures and challenges for Harry.
A 'cartoon xover fanfic' is a type of fan - made fiction that combines elements from different cartoons. It's like taking characters from one cartoon and putting them into the story world of another cartoon. For example, you might see a fanfic that has characters from 'Tom and Jerry' interacting with those from 'Scooby - Doo'. Fans create these to explore new and interesting story ideas that the original cartoons might not have covered.
Fem Harry in these fanfics usually has a distinct personality. She might be more nurturing, for instance, taking care of younger students at Hogwarts more often. Her magical abilities may also be presented in a different light. Some fanfics show her having an affinity for certain types of magic that the male Harry didn't, like a special connection to nature - based spells. Her social interactions are different too. She could be more involved in the female - centric groups at Hogwarts, which in turn can influence the overall plot as she brings different perspectives and ideas from those groups into the main story.
For a 'harry potter stargate xover fanfic', Daniel Jackson from Stargate would be an interesting main character choice. His thirst for knowledge and understanding of different cultures would make him eager to explore the magical world of Harry Potter. On the Harry Potter side, Ron Weasley could be a main character. His loyalty and his ability to adapt to new situations could play a big role. And of course, Samantha Carter from Stargate with her scientific expertise could be involved in trying to figure out the scientific basis behind magic in the Harry Potter world if there is any.
One interesting idea could be the combination of magic from Harry Potter and the advanced technology of Stargate. For example, perhaps wizards using their magic to enhance or interact with Stargate technology. Maybe a wizard could use a spell to stabilize an unstable wormhole. Another idea might be characters from Harry Potter traveling through the Stargate to different planets and encountering new species and cultures, much like in the Stargate series. They could bring their magic with them and use it in unexpected ways in these alien environments.