Inventoad is the official inventor of the Mushroom Kingdom. He has made many different inventions ranging from fun holographic toyd to machines that help Mario out on his adventures. He has a best friend named Elvin Gadd who is also an inventor and scientist.
He first appeared in Super Mario 3-D Galaxy, where he helps Mario out by supplying him with a portal that allows people to travel to other dimensions.
Inventoad is set to appear in many future Mario titles.