Alice is another character worthy of focus. Her ability to see the future gives her a unique role. In a fanfic, you can explore how she uses this power to protect her family and friends. Also, her relationship with Jasper and how they met and fell in love can be a great sub - plot in the Restoration Twilight fanfic.
Edward is always a great character to focus on in a Restoration Twilight fanfic. His internal struggle between his vampire nature and his love for Bella is very interesting. You can explore his past more, his family relationships, and how he navigates the challenges of being in love with a human.
Sinestro can be an interesting character to focus on in an 'emerald twilight fanfic'. His relationship with the Green Lanterns, especially Hal Jordan, was complex. You could write about his role during the Emerald Twilight, whether he was secretly manipulating events or if he had his own agenda that was related to the chaos. Also, Guy Gardner has a fiery personality. Focusing on him could add a lot of action and conflict to the fanfic as he reacts to the events of Emerald Twilight.
One idea could be exploring a different path for the characters in a Restoration Twilight fanfic. For example, what if Bella had a different power? Maybe she could control the elements, and this would change the dynamics with the vampires and werewolves. It could add new twists to the love triangle and the overall plot.
The main hero, of course. They are often the center of the action in the original story, so there's a lot of material to work with. You can explore their uncharted emotions or put them in new and challenging situations.
Edward, even though he is absent for a large part of 'New Moon', still has a big impact on the story. Fanfic might explore his time away, what he was thinking and feeling, and how his return would be different if the story was told from a different angle.
Jacob Black is definitely a popular choice. He has a complex character arc in the original series and fans often like to explore more of his backstory or his future in fanfics. His relationship with the other wolves and his feelings for Bella can be further delved into.
I think focusing on the Wattersons family as a whole can be really interesting in a Gumball fanfic. You can show their family dynamics, like how Richard's laziness affects the household, or how Nicole's strictness is both a help and a hindrance. Then there are the friends like Carrie, the ghost girl. Her spooky nature and her friendship with Gumball and the others can add a unique element to the story. And Tobias, with his one - sided crush on Penny, can also bring in some elements of unrequited love and jealousy into the fanfic.
Jack is a great character to focus on. He's the main character, so there's a lot of material to work with. His growth in martial arts and his relationships with the other characters are rich areas to explore. For example, you could write about his struggle to master a new move and how his friends help him.
Philip and Elizabeth Jennings are obvious choices. Their complex relationship and double lives are full of potential for fanfic exploration. You can create scenarios that further test their loyalty to each other and to their country.
The main characters are always a great choice. Their pre - established relationships and storylines provide a solid foundation to build on. You can expand on their love story, or their struggles against the political backdrop of the story.
Definitely the main character's closest friends or allies. Their relationships can add depth and emotion to the fanfic. Also, antagonists are important. A well - developed villain can create conflict and tension. You can explore their motives and make them more than just a one - dimensional 'bad guy'. And don't forget about those characters who seem minor at first but have hidden potential or secrets.