The main characters include Miles Morales, who is a key figure as he discovers his powers and tries to fit into the world of Spider - Men. Peter B. Parker, an older and more jaded version of Spider - Man, is also important. Gwen Stacy, as Spider - Woman from another universe, is among the main characters too. Their interactions and different personalities drive the story forward.
The key features include unique art styles translated into written descriptions. It also has diverse characters from different spider - universes, which makes the story rich and complex.
The Spider-Man: Spider-Verse comic books have been around for a few years now. They first appeared in a specific period, but the exact age depends on when you start counting.
You can't really 'watch' fanfiction in the traditional sense like you do a movie. Fanfiction is written text. However, you can find Spider - Man: Into the Spider - Verse fanfiction on various fanfiction websites such as Archive of Our Own (AO3) or FanFiction.net. Just search for the relevant tags related to the movie on these platforms.