Max Minner is a circus strongman turned insurance agent as well as being the Green Humungonaut.
He has gray hair, and he has a mustache.
PersonalityHe easily loses his temper with his brother.
Powers and abilities
As a former circus strongman he has stupendous strength. His feats as the Green Humungonaut were done using his own muscle power.
Max Minner and his brother Jax Minner were former circus strongmen until one of them left the circus business.
Scooby-Doo! Mystery Incorporated
Afterwards, Max Minner ran a insurance agency and had a big rivalry with his brother Jax so they dressed as Humungonauts to destroy each other's business with Max as the Green Humungonaut.
When it came to a dock that Mystery Incorporated set a trap for, the Green Humungounaut ended up fighting the Red Humungonaut until they both easily got caught in Fred's trap. When Sheriff Bronson Stone and Mayor Fred Jones, Sr. arrived with the cops, Velma unmasked the Humungounauts as Max and Jax Minner. After their backstory, Max and Jax stated that they would've got away with it to "if it weren't for my meddling brother." This caused the brothers to fight again as two police officers tried to break it up. (Battle of the Humungonauts)