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)
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.