Within the last 12 years or so, the isekai subgenre of Japanese anime took off and flooded the market with countless titles. By now, most anime fans have decided whether they love or hate isekai, with many of the subgenre's tropes either bringing in new fans or driving them away. Plenty of isekai tropes are overused or have aged badly, but open-minded fans may find plenty to like in the non-problematic tropes if they try.
Source：https://www.cbr.com/10-best-isekai-tropes-in-anime/
