Who could be the main antagonist in a 'Naruto Saves Tobirama' fanfiction?

It could be a rogue ninja who has discovered some ancient and dangerous jutsu that Tobirama once sealed away. This antagonist would be seeking to use the jutsu for their own evil purposes and Tobirama, in his reborn state, has to stop them.

Perhaps it's a group of mercenary ninjas. They've been hired by someone who has a grudge against Zabuza. They see Zabuza as an easy target when he's alone or vulnerable, but Naruto shows up to spoil their plan.

Perhaps a new and original antagonist could be created for this fanfiction. This antagonist could be a rogue ninja who has mastered a forbidden jutsu that allows him to manipulate time as well. He could be the one who sets up the events that lead to Minato's endangerment, and Naruto has to figure out his motives and stop him while also saving Minato.

It could be a rogue ninja who is using the poochyena for some sort of evil experiment. Naruto has to stop this ninja from harming the poochyena.

Well, one possibility is that Naruto travels back in time. Maybe he accidentally stumbles upon a dangerous situation where Tobirama is about to be defeated by a powerful enemy. Naruto, with his strong ninja skills and never - give - up attitude, jumps into the fray and uses his Rasengan or other powerful jutsus to fend off the enemy and save Tobirama.

Maybe an old enemy of Madara who realizes that by targeting Naruto, he can get back at Madara. Since Madara has some sort of connection or interest in saving Naruto in this fanfiction, the enemy thinks that if he can harm Naruto, he can either draw Madara out or simply cause him pain. This enemy could be a powerful rogue ninja with a vendetta against Madara.

It could be someone like Madara Uchiha. He's extremely powerful and his goals are often in conflict with Naruto's. Goku would have to face his Sharingan abilities and his vast array of jutsu.

It could be a new, self - made villain. Maybe a rogue ninja who was once rejected by the Hidden Leaf Village. He blames Naruto for his misfortunes and decides to target his sister as revenge. This villain would have his own set of unique and dangerous jutsu, which Naruto would have to figure out how to counter in order to save his sister.

It could be Palpatine. Since Anakin is going against his wishes by saving the younglings, Palpatine would see this as a threat to his plans. He might send more clone troopers or even some of his dark side minions to stop Anakin.

Maybe it's an ancient evil entity that has been awakened by the combined power of Naruto's chakra and Wonder Woman's divine energy. This entity sees them as a threat to its plan of ruling both universes and thus tries to eliminate Wonder Woman first, which is when Naruto steps in to save her.