The reaction of the Dragon Ball characters to Thanatos' invasion would be complex. Goku, as always, would approach it with a sense of adventure and the desire to test his limits. He would be the first to reach out to Thanatos in combat. Vegeta would be seething with anger at the thought of someone invading their territory. He would fight with all his might, using his Galick Gun and other powerful attacks. For the younger characters like Trunks and Goten, they would be inspired by the older fighters. They would follow their lead and contribute in their own ways. The non - Saiyan characters like Krillin and Tien would use their unique fighting styles and skills. The Dragon Ball universe has a long history of coming together against threats, and this would be no different.
Goku is almost surely a main character. His never - ending pursuit of strength and his role as the protector of Earth make him a central figure. Bulma could also be a main character in this fanfiction. She is highly intelligent and often provides crucial technological support in the Dragon Ball universe. Also, Goten might be involved as he is Goku's son and could play a part in whatever events are unfolding in this 'future' - related story.
Well, the Dragon Ball manga could go in various directions. It might introduce new villains, focus more on character development, or even have crossovers with other popular manga series.
The Z - fighters like Krillin and Yamcha would be curious about Naruto. Krillin might try to befriend him quickly, while Yamcha might be a bit jealous if Naruto starts getting a lot of attention. In the Naruto world, characters like Sakura and Sasuke might not even notice Naruto's disappearance at first if he has been neglected. But later, they might realize the importance of Naruto when things start to go wrong in their world without him. And in the Dragon Ball universe, Piccolo would be very watchful of Naruto, trying to figure out his motives and if he poses any threat to the safety of the planet.
The future of Dragon Ball Super manga might involve exploring more of the characters' backgrounds and uncovering hidden secrets of the universe. Maybe there'll be crossovers or collaborations with other series too.
Another good pairing could be with Bulma. Since she is his mother in his own timeline, but in fanfiction, they could have a different kind of relationship. Maybe she helps him with some advanced technology to enhance his fighting abilities.
Gohan would be a great character to pair with Future Trunks. They are both strong and have a deep connection to protecting the future. Their combined power and intelligence could make for some really exciting storylines.