Slimes pervade and appear in just about every anime genre, with viewers accepting them as an easily understood convention. They can be weak or strong, stupid or intelligent, highly capable or function solely as low-level fodder to train newbie adventurers. Since the early 1990s, slimes have progressed from being a rarely used theme in anime to one that has become a staple.
Source：https://www.cbr.com/anime-tropes-in-dragon-quest/
