Re:Zero might seem like one of the several isekai anime franchises that have become popular in the past decade, but it's actually far more than that. Largely regarded as a sterling example of the genre's strengths, the series has been lauded for its high-quality worldbuilding and strong characters. Chief among that cast is Rem, who's easily the most popular character in the franchise.
Source:https://www.cbr.com/rem-rezero/