The Lizardmen were the first creatures that the protagonists fought.Not much about the Lizardman is known except that they are D-class monsters and that they usually live in groups. Among them is a Boss Lizardman who commands the lower ones and is a C-class monster. They look similar to the ordinary Lizardmen except they have a horns on their head and may be bigger. And even higher than that is the A-class version the King Lizardman. This version is many times bigger and has what seems to be crown like feature on his head and has a club tail.
They were first seen attacking One Melo City.