Eli Wallace would likely be one of the main characters. He's smart and resourceful and has been important in previous Stargate Universe stories. Also, Colonel Everett Young, as the leader of the group, would probably play a major role in this 'Back to Destiny' story.
In 'Stargate Universe: Back to Destiny', the main characters would surely include those who have been central to the Stargate Universe series. Eli Wallace, with his scientific acumen, would be vital. Colonel Young's leadership would be needed more than ever. Rush, with his in - depth understanding of the Destiny's systems, would be indispensable. Then there are the other crew members like TJ, Scott, and Greer. Each of them brings something unique to the table. TJ's medical skills, Scott's piloting abilities, and Greer's combat skills could all be essential in their quest to return to the Destiny.
The plot might involve the crew's struggle to return to the Destiny. Maybe they face new enemies or challenges in space on their journey back to the ship. It could also include some sort of time - sensitive mission related to the Destiny.
I'm not entirely sure without reading it specifically, but it's likely to include characters from the Stargate Universe series. Maybe some military personnel, scientists, and adventurers who are part of the stargate exploration team.
Since we don't have much information about the 'back to destiny story', it's difficult to say who the main characters are. They could be ordinary people with extraordinary destinies.
I don't know the specific 'stargate novel' so I can't say for sure. But usually there are brave explorers, scientists interested in the stargate technology, and maybe some military personnel to handle the security aspects.
Obviously, Harry Potter would be one of the main characters. From the Stargate side, Jack O'Neill could be an interesting addition. In the harem, Hermione could be there as she has always been close to Harry in the Potter universe. Also, a female Goa'uld could be part of the harem, bringing her own brand of power and mystery.
Eli Wallace is a great character to feature. His brilliant mind and his journey from a civilian to an important part of the Destiny crew can bring a lot to a crossover. In a crossover with Stargate SG - 1, he could interact with Daniel Jackson, and they could have some really interesting exchanges about ancient knowledge and technology.
The Stargate was a classic science fiction novel. It described how humans would enter interstellar space through a huge stargate in the future to explore unknown planets and civilizations. The movie was full of imagination and technology. In the movie, humans crossed the universe and entered a brand new world by building a huge stargate. This new world had countless mysterious planets and unknown civilizations. Humans needed to constantly explore and take risks in order to survive. The scene design and special effects in the movie were very exquisite, making people feel as if they were there. In addition, the Stargate also discussed some important scientific and philosophical issues. For example, how could humans survive and develop in such a vast universe? How do time and space affect human life and actions? These questions were deeply explored and pondered in the novel, which benefited the audience a lot. All in all, Stargate was a sci-fi movie that was worth watching. It showed the infinite possibilities of science fiction movies and also triggered people's thinking and discussion about the universe and life.
I'm not sure specifically as it depends on the particular fanfiction. But often there could be a brave explorer type character who is eager to discover what lies beyond the stargate in Heliopolis.
Colonel Jack O'Neill is one of the main characters. He's a tough military leader. And then there's Dr. Daniel Jackson, an archaeologist who helps with understanding the different cultures. Samantha Carter, a brilliant scientist, is also a key character.
For a more unexpected choice, you could have the Arbiter from Halo as one of the main characters. He has a complex backstory and his own code of honor. In a crossover, he could team up with a Hunter Guardian. The Hunter's brute strength combined with the Arbiter's strategic thinking would make for an exciting story as they face challenges in both universes.