Jax Minner is a former circus strongman turned insurance agent who disguised himself as the Red Humungonaut to his brother and rival insurance agent, Max Minner who dressed up as the Green Humungonaut.
He has gray hair and mustache, and he has a scar across his left eye.
PersonalityHe and his brother have a strong mutual dislike and they easily lose their temper with each other.
Powers and abilities
As a former circus strongman he has stupendous strength. His feats as the Red Humungonaut were done using his own muscle power.
Jax Minner and his brother Max were former circus strongmen until one of them left the circus business. Afterwards, Jax Minner ran a insurance agency and had a big rivalry with his brother Max so they dressed as Humungonauts to destroy each other's business with Jax as the Red Humungonaut.
Scooby-Doo! Mystery Incorporated
When it came to a dock that Mystery Incorporated set a trap for, the Red Humungounaut ended up fighting the Green Humungonaut until both Humungounauts 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 back-story, 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)