Mecha might not be as popular as it once was, but it's still a very important and influential genre within anime. Another major form of fiction in Japan is the tokusatsu genre, which is defined in the West by the Power Rangers franchise. While Super Sentai and Kamen Rider might be the big names in the genre in Japan, a '90s series has been reborn as a mecha to give them both a run for their money.
Source：https://www.cbr.com/gridman-popular-mecha-anime/
