One idea could be a tournament where characters from both Dragon Ball and Smash Bros universes have to team up in unexpected pairs. For example, Goku and Kirby could be a team, with Goku providing the raw power and Kirby using his unique abilities to support. Another plot could involve a new villain that can absorb the powers of the fighters. This would force the heroes to come up with new strategies and power - ups to defeat him. A third idea is a time - travel plot where a character from Dragon Ball accidentally travels to the Smash Bros world and has to find a way back while also getting involved in the Smash Bros battles.
One idea could be a tournament where characters from Dragon Ball and Smash Bros universes compete for a super powerful artifact. This would bring together the unique fighting styles of both, like Goku's Kamehameha against Mario's fireballs.
One idea could be an OC who has a unique fighting style that surprises all the Smash Bros characters. For example, an OC that can manipulate time during battles, freezing opponents momentarily or speeding up their own attacks. Another could be an OC from a different dimension who enters the Smash Bros world to find a way to save their own realm. They would have to learn the rules of the Smash Bros battles and form alliances with some of the characters.
A plot could revolve around a new character being added to the roster secretly. This character has an unknown power that starts to disrupt the balance in the Smash Bros world, and the other characters must figure out who it is and stop them. For example, this new character could be causing glitches in the battle arenas, making it difficult for the regular characters to fight.
One idea could be a story where all the characters from different universes team up to face a new, unknown threat that is causing glitches in their worlds. For example, Mario, Link, and Pikachu working together in a way they never have before.
One idea could be an OC from a relatively unknown game getting invited to the Smash Bros universe. They have to learn the ropes of the unique fighting style there. Another could be an OC who has a special power that disrupts the balance in the Smash Bros world, causing both chaos and new alliances among the characters.
A Smash Bros fanfic could focus on the backstory of a less - known character. For example, tell the story of how Mr. Game & Watch came to be in the Smash Bros universe. Explore his origin, his first battles, and how he got discovered to be part of the roster.
One interesting plot idea could be a character who is new to the Smash Bros universe and their reaction to meeting all the iconic characters. They could start off in awe, gradually learn the ropes of the battles, and form unexpected friendships or rivalries. For example, a character from a relatively unknown game enters and is initially intimidated by Mario and Link but then discovers they have unique skills that can hold their own. Another plot could revolve around a character's reaction to the constantly changing stages, like being really confused when suddenly transported to a new and wacky stage.
Perhaps there's a tournament in the Smash Bros world that Naruto enters. He's an unknown quantity at first, but as he battles, he shows off his ninja skills. The other fighters are amazed and start to study his moves. This could lead to some interesting training sessions between Naruto and characters like Captain Falcon, where they exchange fighting tips and Naruto learns about high - speed racing attacks from him.
One idea could be a crossover within the Smash Bros universe. For example, characters from Star Allies team up with unlikely allies in the Smash Bros world to face a new, powerful threat that combines elements from both games. Maybe a villain who can manipulate the power - ups and stages in a strange way.
One idea could be an OC from a little - known game series getting invited to the Smash Bros world. They could start off as an underdog, struggling to adapt to the intense battles and different fighting styles. But as the story progresses, they learn from the veteran Smash characters and develop their own unique combat techniques, eventually becoming a respected fighter in the Smash universe.