Here are the potential worlds that MC might travel to in the future:

Irregular at Magic High School

Date a Live!

Genshin Impact

Honkai Star Rail

Arifureta

Tensei Slime Shitara Datta Ken

Here are the potential worlds that could be added to the fusion world:

Seishun wa Bunny Girl Senpai

Twin Star Exorcist

Mieruko-chan