The enchanted objects in the castle like Lumière and Cogsworth would be great. They add humor and charm to the story. Also, Gaston could be included in a different way, like he has a change of heart and tries to help them. And Belle's father could also be a key character, perhaps he discovers something important about the curse.
Well, they could have a wise old mentor figure. This person could be an older neighbor who has lived through a lot and gives them valuable advice when they face difficulties in their relationship or in their adventures.
For a more villainous touch, including Voldemort or his followers could create high - stakes situations. Bellatrix Lestrange could be a terrifying adversary for Harry and Gabi. On the other hand, adding new original characters, like a powerful but reclusive wizard who lives in the Forbidden Forest, could also make the story more exciting.
Definitely Cristina Yang. She has such a strong personality and her interactions with Callie and Arizona could add a lot of spice to the fanfiction. Her no - nonsense attitude and brilliant surgical skills could create interesting storylines, like when she might compete with them in a surgical competition or give them some tough - love advice on their relationship.
Arya could be a great addition. She has her own set of skills and knowledge that could add depth to the story. Murtagh is also an interesting character. His complex relationship with Eragon and his own journey could bring in a lot of drama. Nasuada, with her leadership skills and strategic mind, could play a crucial role in any fanfiction scenario. For example, in a story where there is a war, Nasuada could be leading the troops while Eragon and Saphira are dealing with a magical threat.
Mario could be a great addition. Since Luigi is Mario's brother, his presence could add some family - related drama or comical moments. Sonic could also be included. As Tails' friend, Sonic's brash and confident personality would contrast well with Luigi's more timid nature.
Fluttershy could also be included. Imagine a scenario where Trixie is trying to put on a big, bold magic show and Fluttershy's timidness contrasts with that. Twilight might be caught in the middle, trying to make sure Fluttershy doesn't get too scared and that Trixie doesn't feel like her show is being ruined.
Kyon could be a great addition. He often has an interesting perspective on Haruhi's antics and his interactions with both Haruhi and Mikuru could add depth to the story. Also, Yuki could be included. Her stoic nature contrasts with Haruhi's exuberance and Mikuru's more timid personality, creating some interesting dynamics.
Annabeth could be a great addition. She can provide her strategic mind and wisdom. For example, when Percy and Nico are on a quest, she could stay back at the camp but offer advice through Iris - messages. And when they get stuck, her knowledge of architecture and mythology can help them find solutions.
Natsu could be a great addition. He could be the fun - loving uncle figure who always gets the baby excited with his boisterous personality. His presence would add some humor to the story, like when he tries to teach the baby some of his fire - based magic tricks in a not - so - safe way, and Gajeel has to step in.
Tyrion could be a great addition. His relationship with Cersei is complex, and his intelligence and wit could add a lot of depth to the story. He might be a mediator or a source of conflict between Jon and Cersei. For example, he could try to manipulate the situation to his own advantage while also trying to protect his sister in some way.