Well, you could bring in some new characters like a young and inexperienced recruit who is eager to prove themselves. They could be the source of some comical moments as they make rookie mistakes but also show great potential. Another good addition could be a double agent from a rival agency. This character could add a lot of tension and intrigue as the other spies try to figure out who they really are and what their true intentions are. And don't forget about the shadowy figure who is pulling the strings behind all the espionage activities, a kind of mastermind villain.
Definitely the classic spy archetypes like the suave and experienced agent, the tech - savvy gadget expert, and the tough - as - nails female agent. You could also include a mysterious informant who has connections all over the underworld. This character could provide crucial leads but also be a bit of an enigma, making the spies question their motives.
In a Spy Game fanfic, it would be cool to include a character who is an expert in disguise. They could transform into anyone at will, which would be very useful for infiltration missions. There could also be a character who has a photographic memory, which helps in remembering important details like passwords or the layout of enemy bases. And a character with a special skill like parkour would be exciting to include, as they could easily navigate through rooftops and other difficult terrains during chases and escapes.
If it's a crossover with a shonen anime like Naruto, Naruto himself could be an interesting addition. His boisterous personality would contrast with Loid's cool and calculated nature. And Anya would be fascinated by his ninja skills.
The game characters included Eloy from Horizon: Zero Dawn, Mandrill from Original Gods, characters from Perfect World: Clash of the Gods, characters from Immortal Family, characters from Condor Shooting, characters from Weissenasche Corridor, characters from Kingdom of Two: The characters in the Intertwined Worlds, the characters in the Ancient Love Song, the characters in Tower of Fantasy, the characters in the Adventures of the Dragon Quest Dai Yi, the characters in the New Legend of the Condor Heroes, the characters in the Clouds of Immortals, Judi Alvarez in the Cyberpunk 2077, Alice Gainsburgh and Tifa Lockhart in Final Fantasy 7: Remake, Yuna in Final Fantasy X - 2, Fire Dance and Chun Li in King of Fighters, Lara Croft in Tomb Raider, Lady in Devil May Cry, Ada Wong in Resident Evil, and Resident Evil 3: Jill Valentine in the Remake, Ashley Graham in Resident Evil 4: Remake, Mrs. Timis Treku in Resident Evil 8: Village, Yurha Type 2 B in Neil: Mechanical Age, Kasumi in Dead or Alive, Witcher 3: Yennefer, Trissy, and Ciri from Wild Hunt, Leni from the Halo of Alden, Emily from Shame 2, Firelady from Dark Souls 3, and the characters from the novel Game Character.
Definitely Ash and his Pikachu. They are iconic in the Pokemon world and having them in a 'pokemon xy' fanfic can add a sense of familiarity and excitement. Serena is also a popular choice as she has her own charm and goals in the 'xy' series. Another character could be Clemont, with his inventions adding an interesting technological aspect to the story.
You could include Winter Schnee. Her strict military upbringing and her relationship with Weiss can be a source of conflict and growth. Additionally, Mercury Black, with his acrobatic fighting skills and his loyalty to Cinder, can be used to show the darker side of the RWBY world and add some intense fight scenes to the fanfic.
Arya Stark would also be a great addition. She was a fierce and independent character. In the afterlife, she could be using her skills to either protect the other spirits or cause some chaos among those she didn't like in life. Maybe she's on a mission to take revenge on the remaining enemies of her family, even in the afterlife.
Kuroko and Kagami are definitely popular choices. Kuroko with his unique 'phantom' style of play and Kagami's powerful and aggressive style make for great dynamics. Also, Aomine is often included as he is a strong and complex character. His rivalry with Kuroko can add a lot of tension to the story.
You could include his sidekick, a witty and agile thief named Lira. She could provide comic relief and also be useful in sneaking around. Another good character would be the wise old wizard, Merlinus. He could offer Arcules advice and knowledge about the magic in the world. And a villain like the shadowy warlord, Zargoth, would be great to create conflict.
Courtney Whitmore (Stargirl) herself is, of course, essential. But adding characters like Pat Dugan, her step - father, can bring in more family - dynamic elements. He could be a source of wisdom and support for Stargirl in the story.
You might also consider creating new characters. For instance, a scientist who is a descendant of Victor Frankenstein and is trying to either correct his ancestor's mistakes or continue his work in a more ethical way. Or a journalist who discovers the existence of the monster and decides to expose the story, which would then lead to a whole new set of events and interactions involving all the other characters.
In the spy vs spy game story, the most important characters are the two spies. They are both very secretive and have their own motives. They are constantly at odds with each other, and their actions drive the whole story forward. There may be other minor characters like informants or handlers, but the two spies are the focus.