His old team would be Sasuke, Sakura, and Kakashi. They are the main characters associated with Naruto's early team experiences. In the context of this fanfic where they die, it's likely to have a huge impact on Naruto and the overall story.
The members of Naruto's old team are Sasuke, Sakura, and Kakashi. Sasuke was Naruto's rival and friend, Sakura was their female teammate, and Kakashi was their sensei. Their deaths in the fanfic would change the course of Naruto's life and the story's development significantly.
Naruto would likely be devastated. His old team was an important part of his early life in the ninja world. He might initially go into a state of shock, unable to believe that they are gone. Then, his grief could turn into anger, vowing to find out who was responsible and make them pay.
It could be some of the younger ninjas from the village who look up to Naruto. Maybe a young genin who has a special ability with earth jutsu, and another who is really good at stealth but lacks confidence. Naruto would then help them grow.
Sasuke would likely be devastated. Despite their past differences, Naruto was his rival and in a way, his closest friend. He might go into a deep state of regret and isolation. Sakura would be heart - broken. She loved Naruto, and his death would be a huge blow to her. She might become more withdrawn and focus all her energy on her medical ninjutsu. Kakashi would be filled with a sense of failure. He was Naruto's teacher, and he would feel responsible for not being able to protect him.
Typically, his old team could include Pikachu, of course. Then there might be Charizard, Bulbasaur, Squirtle, and others like Greninja. These Pokémon have been with Ash through different adventures in various regions.
Typically, in fanfiction, Naruto is a given. Anko is there as well. Other members could include characters like Shikamaru, who would bring his strategic thinking to the team. Maybe Sakura could also be part of it, adding her medical skills. Another possible member could be Kiba with his unique tracking abilities and his dog Akamaru.
Typically, in Naruto, Team 1 consists of Sasuke, Naruto, and Sakura. In fanfics, they are often the main characters of Team 1, but sometimes fanfic authors might add new characters or change the dynamics a bit.
Sasuke might initially be indifferent on the surface, but deep down he would feel a sense of loss. He has always had a rivalry with Naruto, and Naruto's departure would mean an end to that dynamic. Sakura would be devastated. She has grown to care about Naruto as a friend and teammate, and his leaving would leave a big hole in the team.
Naruto and Shikamaru would have an interesting relationship. Shikamaru might find Naruto's impulsiveness annoying at first but would later learn to appreciate his determination. Naruto, on the other hand, would respect Shikamaru's intelligence and might try to learn some strategic thinking from him. With Choji, Naruto would bond over food very quickly. They could have eating contests and in the process, become really good friends. As for Ino, Naruto would probably have a bit of a rocky start. Ino might see Naruto as a bit of a nuisance, but as they go on missions together, she would see his good heart and they would become friends too.
Sakura's reactions can vary. Sometimes she tries to get revenge on Naruto for his pranks. If he plays a prank that makes her look silly in front of Sasuke, like the fake love letter prank, she'll be really mad and try to think of a way to make Naruto pay. Sasuke might pretend not to care, but if the prank affects his image too much, like the hair product switch, he'll give Naruto a cold stare. Kakashi is more laid - back and just watches the whole thing unfold like it's entertainment.
One possibility could be Boruto as a new - age Naruto - like character. Sarada, with her Sharingan and Uchiha heritage, could be another member, similar to Sasuke. And for the third member, maybe a new character like a young ninja from a small and previously unrecognized clan who has a unique chakra ability. This new character could bring in fresh dynamics to the team.