Okay! So, here's a list of potential Worlds that Nick's going to travel to, as well as any Another Riders he may face against. The potential locations are:
The World of Pokémon (battle against Kamen Rider Another Gotchard)
The World of Honkai Star Rail (battle against Kamen Rider Another Den-O)
The World of K-Pop Demon Hunters (battle against Kamen Riders Another Revi and Another Vice)
The World of Zenless Zone Zero (battle against Kamen Rider Another Zero-One)
World of Glitch Techs (battle against Kamen Rider Another Ex-Aid)
World of Once Human
World of Kamen Rider Legend (not by choice. Nick will basically go through the same thing as Houtaro/Kamen Rider Gotchard)
Feel free to suggest other Worlds that Nick could travel to in his journey across the Multiverse, and if he should fight an Another Rider. Each world Nick'll go to will be one chapter long, unless it's the world he decides to make his new home.