It depends on personal preferences. Some might consider the character design, storylines, or the overall charm of the cartoon. For me, it's usually the uniqueness of the characters that decides.
Another unique part is the new storylines that can be created. Since it's fanfiction, authors can take the concept in all sorts of directions. They can create tournaments where Naruto has to fight his way through the entire Smash Bros roster, or they can write about how Naruto's presence in the Smash world affects the balance of power there. There are endless possibilities for creative and unique stories.
Speedy Smash was a manga that told the story of Xiao Zhengyu, the protagonist of a table tennis club. He found out that the person he confessed to back then was actually a member of the club. This caused him to start a journey about his dream in the struggle between his dream and reality. The manga was created by Peach and has been completed with a total of 97 chapters. Other than that, it also provided online reading resources for some manga chapters. As for the specific content and plot of the rapid smash, the information given so far was insufficient to provide more details.
One idea could be a tournament arc where Naruto characters enter the Smash Bros universe and compete against the regular Smash Bros characters. They have to adapt to the different fighting styles and arenas.
One main theme is usually the clash of different fighting styles. Naruto has his ninja skills and the Smash Bros. characters have their own unique moves. Another theme could be friendship, as Naruto might form bonds with other characters in the brawl.
Well, a really engaging plot point often involves Naruto bringing his unique ninja techniques into the Smash Bros arena. For instance, his ability to use chakra in a world full of characters with different power sources. Also, the idea of Naruto trying to understand the Smash Bros power - ups and how they can enhance his abilities or those of his newfound allies. And then there's the whole concept of Naruto facing off against characters with completely different moral compasses than his own, like some of the more villainous Smash Bros characters.
There are several good ones. For example, 'Naruto in Super Smash Bros: The Ultimate Battle'. This fanfiction details Naruto's entry into the Super Smash Bros tournament. He uses his shadow clones and rasengan in creative ways against opponents like Samus and Kirby. The author does a great job of blending the Naruto universe with the Super Smash Bros gameplay elements. It's full of action - packed battles and some really interesting character interactions.
However, you can't discount characters like Kirby in this context. Kirby has the ability to copy the powers of his opponents in the Super Smash Bros games. If he were to face Naruto characters, he might be able to copy their jutsu and use it against them. Also, his floating ability and quick attacks make him a formidable foe. So, it really depends on how the author of the fanfic wants to balance the powers and abilities of the different characters.
Well, you could have a story where a new villain emerges in the combined Naruto - Super Smash Bros world. This villain has the power to steal the abilities of the characters. Naruto and his comrades, along with the Smash Bros characters, have to team up to stop this villain. They go on a journey across different stages of the Smash Bros game to find the source of the villain's power and defeat him. Along the way, there are many battles, character development, and some humorous moments as the two different groups of characters interact.