Well, Wolverine is always a great choice. His complex backstory and his rough - and - tumble personality can add a lot of action and drama to the fanfic. Then there's Professor Xavier. You can explore his leadership and his dreams for mutant - human coexistence in more depth. And Storm is also an excellent character to feature. Her powers are so cool, and she has a strong personality that can drive the story forward.
Magneto can be a very interesting character to include. His different views on mutant - human relations compared to the X - Men can create a great source of conflict. Jean Grey is also a good option. With her powerful psychic abilities, she can be involved in all kinds of mind - bending storylines. And don't forget Beast. His unique appearance and his intelligence can bring a different flavor to the 'X Men Ascension' fanfic.
Naruto himself is an obvious choice as he is the main character of the Naruto series. His determination and unique abilities like the Rasengan would add a lot to the story. Ryu Hayabusa from Ninja Gaiden is also a great pick. He is a skilled ninja with his own set of powerful moves. Their interaction would be really interesting.
In a Percy Jackson and X - Men fanfic, Storm would be a fascinating character to include. Her control over the weather could be compared and contrasted with Percy's water powers. She could also interact with the nature - related aspects of the demigod world in an interesting way. On the demigod side, Nico di Angelo would be really cool. His powers over the dead and his brooding personality would be an interesting addition to the mix. Among the X - Men, Beast would be a great character. His super - intelligence and his unique physical form could lead to some thought - provoking interactions with the demigods, especially those like Annabeth who value knowledge and intellect.
Deadpool and Wolverine are a great pair. Wolverine's serious and no - nonsense attitude contrasts perfectly with Deadpool's zany and irreverent personality. They could have some epic battles where Deadpool's constant chatter drives Wolverine crazy, but also some moments where they realize they're not so different. Another good pair would be Deadpool and Rogue. Rogue's power - absorption ability could lead to some interesting situations when she tries to touch Deadpool, and his unpredictable nature would keep her on her toes.
Xander is a great character to feature. He's always full of energy and getting into fun adventures, which can make for an exciting story. Also, Emma, as she's often the voice of reason among the campers and can bring a sense of stability to the plot. And Lou, the counselor, is another good choice as she has to deal with all the camper's antics.
Oliver Queen is an obvious choice. He has such a complex backstory with his time on the island, his return to Starling City, and his evolution into the Green Arrow. His relationships with other characters like Diggle, Felicity, and Laurel also offer a lot of material for a fanfic.
Erina could also be great. Her refined palate and high standards add a layer of complexity. A fanfic could explore her journey of trying new and unorthodox cooking styles while still maintaining her elegance and grace in the kitchen.
The neuralyzer is also a popular 'character' in a sense. Many fanfics might focus on a story where the neuralyzer goes wrong or is misused. But in terms of living characters, the worms are quite popular too. They add a bit of humor to the 'Men in Black' universe, and a fanfic could center around their misadventures or their secret roles within the MIB that the agents don't fully understand yet.
A cool 'X Men Ascension' fanfic idea would be to set the story in an alternate universe. Maybe in this universe, the roles are reversed, and the mutants are the ones in power while the humans are the ones feared. How would the X - Men handle this situation? Would they be more benevolent rulers or would power corrupt them? It could be a really interesting exploration of the 'X Men Ascension' concept.
Syd is a character that can bring some humor to a fanfic. His interactions with Kat and his role in the story can be expanded. He could be involved in some comical misadventures while also being an important part of the group.
In my opinion, Bergy is an underrated character who could shine in a fanfic. He has that nerdy charm and his technical skills could be put to great use in a story. Maybe he discovers a glitch that is related to his area of expertise and he has to take the lead in fixing it. Miko and Five are also obvious choices. Miko's enthusiasm and Five's cool - headedness can create a great dynamic. They could be on a mission to stop a glitch that is spreading across all the arcades in town and along the way, they have to overcome their own personal differences as well as the challenges posed by the glitch.