A character like Arale from Dr. Slump could be an unexpected opponent. She has her own set of wacky and powerful abilities. Her innocent and child - like nature combined with her strength could throw Saitama off. He might not know how to deal with someone who is so different from the opponents he usually faces in his own universe.
An unexpected opponent could be King. King, who is known for being a fraud in terms of strength, could somehow be made into a real threat in the fanfiction. Maybe he gets a power - up that makes him a formidable foe for Saitama. It would create a lot of comical and also tense moments as Saitama tries to figure out what's going on with King.
Genos could be an unexpected opponent. He might be forced to fight Saitama due to some mind - control or a misunderstanding in the rules of the tournament. It would be really interesting to see how Saitama would handle fighting his own disciple, and how Genos would fare against his master's incredible strength.
Maybe in the fanfiction, the Tournament of Power rules are changed specifically for Saitama. Instead of just fighting, he has to complete various challenges like making his opponents laugh before knocking them out. This would add a humorous twist to the story as Saitama tries to come up with different ways to make his opponents crack up, all while still being his super - strong self.
Iruka. He's mostly seen as a teacher and not a combat - heavy character. But in fanfiction, he could be given some hidden powers or a special training arc before the tournament. His inclusion would be unexpected because everyone underestimates him, but he could use his knowledge of Naruto and the other ninja to come up with unique strategies in the tournament.
Saitama is a very powerful hero in the One Punch Man universe. He can defeat any opponent with just one punch. He has a simple appearance and a somewhat laid - back personality.
Sometimes King is paired with Saitama. King, known for his false reputation of being a super - strong gamer in the original story, could be in interesting interactions with Saitama in the fanfiction's gaming context. Maybe they compete in a gaming tournament within the fanfiction, and Saitama's effortless wins baffle King.
He could interact with Tsukune, the main human character in the Yokai Academy setting. They might share their experiences of being different in their respective worlds.
Well, perhaps a character from a very low - key anime that no one expects. Like a character from a slice - of - life anime who has some hidden power. Maybe a schoolgirl who can control time in short bursts, but has been keeping it a secret in her normal life.
Jiren could still be a tough opponent in the 'vegito tournament of power fanfiction'. His power level is extremely high, and he has great combat skills. Even for Vegito, defeating Jiren would be no easy feat as Jiren has proven his strength time and again in the original tournament.
According to the information given, I recommend a light novel called " You Might Die With This Punch ". After three years of training, the protagonist, Xia Fan, obtained the ability of a one-hit man and traveled to a Xianxia world. Xia Fan only wanted to live a good life, but there were always troubles that came knocking on his door. Some people even posed a threat to him. Even so, Xia Fan still insisted on his principles and lifestyle. Therefore, I recommend this novel. I hope you like it.😋
Captain Jack Sparrow from the Pirates of the Caribbean world. Imagine him being thrown into the Tournament of Power. His wily and unpredictable nature, along with his knack for getting out of tough situations, would make for some really interesting interactions with the more serious combatants in the tournament. He could use his cunning to outwit opponents rather than relying on pure strength.
Another strong opponent could be Hit. Hit has the ability to manipulate time with his time - skip technique. This would give him an edge against Broly. Broly's brute strength might not be enough when Hit can literally disappear and reappear at will, striking at Broly's weak points during his time - skips.