In my opinion, the best characters to feature in a Naruto Pokemon fanfic would be Naruto, Sakura, and Shikamaru. Naruto is obvious as he's the main character and his never - give - up attitude can inspire his Pokemon. Sakura has the medical skills which could be useful in treating injured Pokemon. Shikamaru is super intelligent and could come up with great strategies for Pokemon battles. They could all have different types of Pokemon that complement their personalities, like Naruto with a Fire - type Pokemon, Sakura with a Grass - type for her healing abilities, and Shikamaru with a Psychic - type to match his intelligence.
Naruto, of course, is a must - feature character. He's the main character of the Naruto series and his addition to a story involving Susanoo would bring a lot of interesting dynamics. Sasuke is also a great choice as he is an Uchiha and has a natural connection to Susanoo. Another good character could be Kakashi. He has experience with different powers and could be a mentor - like figure in a fanfic about Naruto and Susanoo.
Kakashi would be an interesting character to include. His intelligence and combat experience could make for an exciting story as he figures out how to best utilize the shield in different scenarios.
Sasuke is an obvious choice. He's already associated with swords like the Kusanagi. A fanfic could explore his further development with the sword, perhaps unlocking new abilities or techniques.
Naruto himself is a great choice. His goofy and determined nature can lead to many comical situations. Shikamaru too, with his lazy yet intelligent attitude. His sarcastic remarks can add humor. And Lee, his over - the - top enthusiasm for training and his unique fighting style can be a source of comedy.
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.
Naruto himself is an obvious choice as he is the main character. Sasuke would also be great as he has his own unique combat style that could blend well with martial arts. Rock Lee is another one, since he already focuses on taijutsu which is a form of martial arts in the Naruto universe. He could show off some really cool and powerful martial arts moves.
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.
Charizard is also great. You could write a story about a young trainer who has a special bond with their Charizard and they go on a journey to find a rare item that can make Charizard even more powerful. This could involve battles with other strong trainers and their pokemon.