A crossover with the 'Percy Jackson' series could work well. Harry, as a mother, might have a child who is a demigod. They would then have to deal with the world of Greek gods and monsters while also raising their child. Additionally, a crossover with the 'Hunger Games' universe could be made, where Harry, as a mother, has to protect their child from being chosen for the deadly games in a dystopian society.
A potential crossover could be with the 'Lord of the Rings' universe. Harry, as a mother, could find themselves in Middle - earth, perhaps with their child being a key figure in the fight against Sauron. Another could be a crossover with 'Star Wars'. Imagine Harry, as a mother, on a far - flung planet in the Star Wars galaxy, trying to keep their child away from the clutches of the Sith or the Empire.
He could interact with characters from the crossover world who are used to the concept of motherhood. For example, if it's a crossover with a fairytale world, he might interact with fairy godmothers who could offer him advice on how to be a good mother.
Hermione would likely be a strong ally. She's always been Harry's friend and is smart and resourceful. In this scenario, she could help fem Harry with spells and strategies to keep her and her child safe.
Luna Lovegood would be an interesting addition. Her unique view of the world and her kindness would make her a great part of the harem. Draco Malfoy could also be thrown into the mix in a more reformed state, adding some tension and complexity. And from a crossover aspect, perhaps a mermaid character who has the ability to transform into a human during the wedding and is drawn to Harry's heroism.
Well, in this type of fanfiction, Hermione could also be an important character, but in a different light. Maybe she tries to stop an evil Harry, or perhaps she is corrupted by him and becomes his accomplice. Other characters like the White Witch from Narnia could be involved. Her icy magic and cold - hearted nature could be an interesting contrast or complement to an evil Harry's powers. And don't forget about characters from other YA dark fantasy series, such as the Darkling from Shadow and Bone, who could potentially cross paths with an evil Harry.
Hermione Granger would definitely be a key character. Her intelligence and magical ability would make her an important part of any harem situation around Harry. Then there could be characters like Arwen from 'Lord of the Rings'. Her beauty and elven magic would bring a different dynamic. Also, Sakura from 'Naruto' could be included. Her medical ninjutsu and strong will could add to the mix in the harem.
One potential crossover character could be Harry Potter. Imagine Naruto, with his immortality, meeting Harry in the wizarding world. Naruto could teach Harry some ninja skills, and they could fight together against Voldemort. Another could be Superman. The contrast between Superman's superpowers and Naruto's ninja skills, along with Naruto's immortality, would make for an interesting story.
Maybe Naruto from Naruto could be a crossover character. His ninja skills and Ichigo's combat abilities could create some unique fight scenes. Also, their different ideologies about friendship and power could lead to some great character interactions.
Solid Snake is an obvious choice. Since they are from the same general franchise, their encounter could be filled with a lot of drama and action. They could have different views on how to handle certain situations, which would create great story tension.
In a crossover with a post - apocalyptic world, Harry, as a mother, is trying to raise their child in a world full of chaos and danger. They use their magical skills to build a safe haven and teach their child how to survive in this new harsh environment. They might also encounter other survivors with unique abilities and form alliances to protect their family.
Characters from 'Teenage Mutant Ninja Turtles' could be great. Imagine the Ducks and the Turtles teaming up to fight a common foe in the streets of New York. The Turtles' martial arts skills combined with the Ducks' hockey moves would make for an exciting story.