One possible plot could be that Izuku's friends discover his kidnapping and start a rescue mission. They might face various obstacles set by Overhaul and his minions while trying to find Izuku's location.
One idea could be exploring Overhaul's backstory in more depth. Maybe show his childhood and what led him to become the villain he is. Another could be a redemption arc for him, where he teams up with the heroes against a greater evil.
All Might could also be a potential hero to save Izuku. He has a strong bond with Izuku and his presence alone could intimidate Overhaul. He would use his experience and power to rescue Izuku from the dangerous situation.
One idea could be to explore Overhaul's backstory in more detail. Maybe show how he became so obsessed with 'perfection' and order. For example, you could create a scenario where he had a difficult childhood in a chaotic environment, which led him to strive for the extreme control he desires in the series.
Secondly, introduce other characters that can act as catalysts for Overhaul's character development. It could be a hero who challenges his beliefs, or another villain who has a different view on things. Their interactions can bring out different sides of Overhaul. For instance, if he meets a hero who has a very loose and carefree attitude towards life, it could really grate on Overhaul's sense of order and make him question his own rigidity.
Create unique settings. Don't just stick to the usual locations in the 'Boku no Hero Academia' world. Maybe introduce a hidden underground society where Overhaul has a different role or influence. This will add a sense of novelty to your fanfiction.
I'm afraid I can't provide details of the '1x1x1x1 real story' at present. It could potentially be a very personal or niche story. Maybe it's related to a game where the numbers are used in a scoring system or a level - up mechanism, like you need to achieve 1 of something in four different categories represented by the '1x1x1x1'. Or perhaps it's a story in a work of fiction where the numbers are used to create a sense of mystery or order. Without more context, it's impossible to be certain.
One great 'Patton x Logan x Roman x Virgil' Wattpad fanfiction is 'The Four Sides' by [author name]. It beautifully explores their relationships and how they interact in different scenarios. The character development is really well - done, making each character feel unique and true to their original concepts.
One idea could be a story where Logan helps Virgil and Roman understand each other better. Logan uses his logic to analyze their differences and find common ground for them. Maybe they are working on a project together in the mindscape and initially clash, but through Logan's mediation, they start to see the value in each other.