Often in such a novel, there are characters who are the thinkers. They come up with the plans for the rebellious acts in 'The Young Rebels Novel'. And then there are the doers, who carry out these plans bravely.
One of the main themes could be youth's search for identity. Young rebels often struggle to define themselves outside of the norms set by society. Another might be resistance against unjust authority as they rebel against the status quo.
Ezra Bridger is one of the main characters. He is a Force - sensitive boy who becomes a key part of the Rebellion. His character development from a thief to a Jedi is a major aspect of the stories.
Neville Longbottom could be a central figure in some Harry Potter Rebels fanfiction. He has shown great courage and the ability to stand up against the dark forces. In fanfictions, he might lead a rebellion against some corrupt elements in the Ministry of Magic. His growth from a shy boy to a brave hero in the original series gives him great potential to be a main character in these rebellious stories. And Luna Lovegood could also be important, with her unique perspective and disregard for convention, she could inspire others to rebel in the fanfiction world.
The main characters in 'Star Wars Rebels The Story' play vital roles in the narrative. Ezra Bridger is a central figure. His journey from a lost boy to a key rebel and Force - user is a major part of the story. Kanan Jarrus, as a Jedi, imparts his knowledge and skills to Ezra. Hera Syndulla is the heart and soul of the group, keeping them together and leading them in their missions. Zeb Orrelios provides the physical strength and a different perspective. Sabine Wren's Mandalorian heritage gives her a distinct set of abilities and a unique style. These characters interact, grow, and face challenges together, making the story what it is.
The main characters are Ezra Bridger, Kanan Jarrus, Hera Syndulla, Sabine Wren, Zeb Orrelios and Chopper.
Obviously, Fulcrum is a main character. In many fanfictions, they are often depicted as a very mysterious and resourceful figure.
Obviously, Starkiller is one of the main characters. He's the central figure around which the fanfic often revolves. His abilities and backstory play a big role in driving the plot.
It could be Pikachu. Pikachu is a very popular Pokémon and it's not a legendary. It might get tired of seeing the legendaries always in the spotlight and decide to lead the rebellion. Another possibility is Charizard. Charizard is strong and has a bit of a rebellious streak already, so it would make sense for it to be involved in something like this.
In 'Lego Star Wars Rebels Ghost Story', I would expect characters like Kanan Jarrus to be there. He's Ezra's mentor, a Jedi Knight. Also, Hera Syndulla, the Twi'lek pilot who leads the Rebels in their ship, the Ghost. Sabine Wren, the Mandalorian explosives expert and artist, is also likely to be a main character as she is an important part of the Rebels' team.
The main characters might include a young outcast who feels marginalized by society and turns to 'evil' ways as a form of retaliation. There could also be a young idealist who initially tries to stop the 'evil' but gets drawn into it somehow. And there may be a character who is a victim of the young and evil ones, whose story drives the plot forward in terms of showing the consequences of their actions.