Monspeet is one of the Ten Commandments, but far from my favorite on the team of deadly demons.

Him and and his semi-girlfriend Derieri gave up their bodies to become Endura during the first holy war. They become strong enough to overpower even the archangels. Elizabeth uses her healing powers to return them to normal.

Like almost all the other demons, he was sealed away for 3000 years. He’s definitely looking to get revenge on Meliodas. Despite Elizabeth saving him… Ungrateful.

We don’t really know what his commandant does, but his big attack is the Hellfire bird. Pretty impressive, Meliodas uses it against him with full counter and almost kills him with it.

He hides out with Derieri after appearing to be obliterated. They almost give up their old ways and try to live peacefully. Until Estarossa comes looking to kill them and steal their Commandments.

He reveals his other power, the ability to switch objects or even himself with another object or person. He almost gets the upper hand on Estarossa until Derieri is put in danger.

And he sacrifices himself to save her. I have to give him respect for that. Ironically she dies not long after that, so he perished for literally nothing. Whoops.