It could also be a love story where the fem character falls in love with the idea of Fawkes. She might be an artist who is constantly inspired by Fawkes' beauty and grace. She tries to capture Fawkes in her paintings and drawings, and through this process, she discovers a deeper connection to the magical world. As she delves deeper, she uncovers secrets about Fawkes that are intertwined with the history of magic itself.
The plot might involve the fem character being in danger and Fawkes coming to her rescue. Since Fawkes has the power of rebirth, he could sacrifice himself to save her in some way, and then be reborn in a more powerful form. This could then set off a chain of events where she has to figure out how to use Fawkes' new powers to fight against an emerging dark force.
Perhaps an older student who has been overlooked in the past. She's not one of the popular kids but she has a strong sense of justice. When she witnesses something wrong happening to Fawkes, she steps in to protect him. This act of kindness makes her the center of a series of adventures involving Fawkes and the secrets he holds.
One possible plot could be that fem Arceus somehow ends up in the Harry Potter universe. Maybe she's drawn there by the powerful magic. She could then use her unique abilities to help Harry and his friends in their fight against Voldemort, like using her power to heal the injured or to create barriers against dark magic.
One idea could be that a female version of Fawkes has a special bond with Harry. She could be a guide for him in some magical tasks that Dumbledore has secretly set for him. For example, leading him to hidden magical artifacts.
One interesting plot could be that the fem Naruto character is on a quest to find a way to return to her own world. Along the way, she teams up with Harry Potter and his friends. She uses her ninja skills to help them fight off dark wizards, and in return, they help her figure out the magic needed to get back home.
The relationship could start with Harry noticing fem Fawkes' unique beauty and grace. Since Fawkes has always been associated with Dumbledore, Harry could be initially curious about this female version. As they interact more, they could develop a mutual respect for each other's magical powers.
In a 'Harry Potter x fem Bowser' fanfiction, it could be that fem Bowser is a part of a prophecy in the Harry Potter world. The prophecy states that a powerful being from another realm will come to either save or destroy the wizarding world. Harry and his friends are initially skeptical but soon realize that she has her own reasons for being there. She could be on a quest in her own world that has some connection to the events in the Harry Potter universe, and together they must figure out how to use her presence to their advantage.
One possible plot could be that fem Lucifer, being intrigued by the magic in the Harry Potter world, decides to visit Hogwarts. She might get involved in the fight against Voldemort, using her own powers which are different from the magic in the wizarding world. This could lead to a lot of interesting interactions between her and the main characters like Harry, Hermione, and Ron.
A simple plot could be that fem Harry Potter is magically transported to the Mortal Kombat world. She has to quickly learn the ropes of the Kombat tournament to survive. Maybe she first gets help from a kind-hearted Mortal Kombat character like Liu Kang who shows her the basics of combat in this world.
Well, one possibility could be that Narcissa sees potential in Fem Harry Potter and trains her in the ways of pure - blood magic and etiquette. Maybe she wants to use Harry as a pawn in the wizarding world's power games. Or it could be that Narcissa, having lost Draco in some way, sees Harry as a surrogate to redeem herself. Another idea is that she trains Harry to fight against the Dark Lord from the shadows, using skills that only the Blacks possess.
Another theme could be magic and mystery. Fawkes is a magical creature, and in these fanfics, the exploration of his magic and how it interacts with Harry's own powers can be a central theme. Maybe Fawkes has some special abilities that help Harry in his fight against the dark forces. Also, the mystery of Fawkes' origin and his connection to the wizarding world at large can add an interesting layer to the stories.