Polly could be a great supporting role. Since she has a history with Piper, she could bring in some family - related drama. Also, Red would be an amazing addition. Her motherly nature towards Piper in prison could translate into her being a sort of mentor or a source of advice in their married life.
Haley would be a great supporting role. She could offer Peyton advice on pregnancy based on her own experiences. Lucas could also be included, perhaps he helps Nathan with getting ready for the baby, like fixing up a room in their house. And Brooke, she might be the one to throw a baby shower for Peyton and bring in all the fun and glamour to the story.
Renji could also work well. He's always been in the thick of things in the Soul Society. His rough - around - the - edges personality could contrast with the more subtle relationship between Ichigo and Lisa. He might be the one who accidentally stumbles upon their budding relationship and gives some comical reactions.
Kakashi would be an interesting addition. He could act as Naruto's advisor in matters of the heart. Since Kakashi has a good understanding of Naruto's character, he could give Naruto some valuable insights on how to handle his relationship with Shizune. At the same time, Kakashi's calm and collected nature could contrast with Naruto's more impulsive self, making for some engaging interactions within the fanfic.
Annabeth would be a great supporting character. She could be initially suspicious of Miss Martian, thinking she might be a threat to Percy. This would create some tension and drama in the story. Grover could also be included. His kind - hearted nature would make him open to befriending Miss Martian quickly, and he could act as a mediator between Percy and Annabeth when it comes to their relationship with Miss Martian. On Miss Martian's side, Martian Manhunter could play an important role. He could be the one who gives Miss Martian advice about her relationship with an Earthling, and also help her understand Percy's world better.
Definitely include Natsu. His enthusiasm and positive energy can add some light - hearted moments to the story. He could also be the one to accidentally push Cana and Gildarts closer together, like by getting them into a situation where they have to rely on each other. Lucy would also be a good addition. She's a good friend to Cana and can offer a different perspective on love and relationships, having her own experiences in the guild.
Rock Lee would be an exciting supporting character. His energetic and determined personality could bring some humor and motivation to the story. He could challenge Naruto to friendly sparring matches, which in turn could make Ino and Sakura cheer for them. Choji is also a good option. His loyalty to Ino and his friendship with Naruto could create some heartwarming moments. And Tsunade could play a role as well. As the Hokage, she could assign them important missions and also be a mentor figure, especially to Sakura, which would impact the relationship between Naruto, Ino, and Sakura.
Mentor - like characters can also be great in a Percy Piper fanfic. They can guide Percy, pass on wisdom, and help him grow as a character. Maybe an old wizard who has been around for ages and has a lot of knowledge about the magical world.
Definitely her sisters, Phoebe and Paige. They are her closest family and would be there for her throughout the pregnancy. Leo, as her husband, is also crucial. He can provide support and love. Then there could be some of the recurring good witches or magical beings who could offer their help or advice. For example, Grams could appear in Piper's dreams to give her some grandmotherly wisdom about motherhood.
Leo Valdez would also be an excellent character to include. His mechanical skills and sense of humor could lighten the mood during tense situations. He could also create some cool gadgets to help the group in their adventures, like a device to detect mythical energy or something similar.
Seth could be a great addition. His quirky personality could add some humor and unexpected twists to the story. For example, he might accidentally get involved in Marissa and Alex's plans and create chaos in a funny way.