Use vivid descriptions. When describing the arenas or the battles, make it so the reader can really picture it. Instead of just saying 'They fought in the Final Destination stage', describe the floating platforms, the bright lights, and the sense of space. 'The Final Destination stage loomed large, its floating platforms like islands in a sea of blue, the bright lights above casting long shadows as the characters readied themselves for battle.'
It varies a lot. Some can be short, like a few thousand words, while others can go on for tens of thousands.
I'm not sure specifically which one is the longest 'Super Smash Bros. Brawl' fanfic. There are likely many fanfics out there, and it would require a lot of research in the various fanfic platforms to determine the absolute longest one. It could be a complex, multi - chapter epic that delves deep into the game's characters, their relationships, and the battles in the Smash Bros. universe.
It can also strengthen the fan community. Fans who share an interest in these fanfics can come together, discuss their favorite parts, and exchange ideas. This can create a sense of camaraderie among the Super Smash Bros fan base.
You could write a fanfic about the backstories of how the characters got invited to the Smash Bros tournament. Maybe there's some sort of secret council that decides who gets to participate, and there are some political intrigues among the different game worlds regarding this. So, like, Sonic's world is trying to get more representation in the tournament, but there are some forces that are against it.
I'm not sure exactly, but you might find some really long ones if you search dedicated fanfic sites or forums.
The sheer length of 3 million pages makes it special. It can explore the Super Smash Bros world in great depth.
One idea could be a crossover with a classic RPG like Final Fantasy. Characters from Final Fantasy could enter the Super Smash Bros universe and bring their unique abilities. For example, Cloud could use his Omnislash. Another idea is a crossover with an anime like Naruto. Naruto characters would add a whole new dynamic with their ninja skills. And a third idea could be a crossover with a horror game, like Resident Evil. The spooky elements and unique weapons of Resident Evil characters would make for a very different kind of Super Smash Bros fanfic.
The creativity in world - building is also notable. Fanfic writers can create their own versions of the Smash Bros universe, adding new locations or rules. It might include places inspired by the different stages in the game but with a new twist, like a haunted version of a familiar stage.
A unique plot. For example, if it combines the different universes and characters from Super Smash Bros and Infinity War in a way that's unexpected. Maybe having characters from Super Smash Bros interact with the Infinity Stones in a creative manner.
I haven't actually read a 3 million - page Super Smash Bros fanfic. It must be an incredibly long and detailed work. It probably contains a vast array of characters from the Super Smash Bros universe, with complex storylines and character relationships. Maybe it has different arcs for each character's journey, exploring their backstories and how they interact with others in the Smash Bros world.