Vi could be the main character. She's strong - willed and has a connection to both Piltover and Zaun. In a future - watching scenario, she could use the knowledge to protect those she loves and bring about peace between the two areas.
Another possibility is that it focuses on the technological future of the Arcane universe. The story could be about how new inventions in Piltover are going to change the relationship between the two cities. There could be a scientist character who watches the future of technology and tries to either encourage or prevent certain advancements based on what they see.
Yuji Itadori could still be the main character. He might have developed new and more powerful techniques in this fanfiction, and be the one leading the charge against new threats in the future of the Jujutsu world.
It could be Deku's successor. Maybe someone who idolizes Deku and has a similar quirk but with some new twists. They would carry on Deku's legacy and face new challenges in the future.
Well, the Jedi are obviously main characters. It could be well - known Jedi like Obi - Wan Kenobi or Yoda. They would be the ones using their connection to the Force to watch the future.
It could be a rogue Saiyan from an alternate timeline who has come to their universe to prove his supremacy. He is jealous of the power that Goten and Future Trunks possess and wants to take it for himself.
Obviously, Bakugou would be one of the main characters as the story focuses on the encounter with his future self. And also, Deku would likely be a main character. Their relationship has always been a central part of the story, and seeing how Deku reacts to future Bakugou would be interesting. Additionally, Ochaco could be a main character as she has her own unique relationship with both Bakugou and Deku, and her presence could add some different dynamics to the interactions in the fanfiction.
Another possibility is that a new villain emerges as a result of the time - travel or whatever mechanism brings future Deku to the present. This villain could be from a future where Deku's actions (or inactions) have led to a more dangerous world, and he travels back in time to stop Deku from making those mistakes again. However, his methods are extreme and dangerous, making him the antagonist of the story.
Another great way is to engage with the Arcane fan community. Join groups on social media platforms like Facebook or Discord dedicated to Arcane. Fans in these groups often share their own fanfiction or know where to find the best ones. They might also be aware of any projects that are turning fanfiction into something more watchable, like short films or animated series. By being part of the community, you get access to insider knowledge and can discover some really interesting fan - created content related to Arcane.
There are several places where you might be able to find Arcane fanfiction to 'watch' (although typically you read fanfiction). Archive of Our Own (AO3) is a great source. It has a large collection of fan - created works related to Arcane. You can simply search for 'Arcane' on the site and explore the various stories available. Another option could be FanFiction.net, which also hosts a wide range of fan - made content including for Arcane.
In Arcane fanfiction, characters might watch various things. It could be the rise and fall of different factions in Piltover and Zaun. For example, they could be observing the power struggles between the chem - barons in Zaun or the political manoeuvres in Piltover's council. They might also watch the technological advancements that are constantly taking place in Piltover, like the creation of new Hextech devices. Another possibility is that they watch the relationships between different characters develop, such as the complex bond between Vi and Jinx.