Fantasy
Isekai
Mystery
I like Re Zero.
Its pretty much one fo the first isekai i watch, along with konosuba. Every isekai after that feels like being written by incompetent writer who cant even incorporate proper logic.
Despite the entire world of Re:zero being small due to some calamity 400 years ago, and many of the thing being explained with more detail than average story, the entire story and world of Re Zero still feels smreally really big because of the mystery element.
Isekai because i want unexpected people in unexpected place.
And fantasy because i like magic. It makes more imaginative events and suffering possible.