Banktoad

Banktoad is a green Toad from Super Mario Galaxy, who is a member of the Toad Brigade. He has a great love for treasure and can often be found in many different galaxies where he can usually be seen digging for coins.

Super Mario Sunshine
Banktoad first appeared in Super Mario Sunshine, where he is one of the five young Toads that accompany Mario, Princess Peach, and Toadsworth on their vacation to Isle Delfino. Upon arrival, the group finds the island a mess. Soon after, the villain Shadow Mario appears and kidnaps Peach. This causes the Toads extreme sadness and worry. The Toads provide no help, as they spend most of their time in Delfino Plaza. After finishing the game and saving Peach, Banktoad and the others finally enjoy their vacation.

Super Mario Galaxy
In Super Mario Galaxy, Banktoad and the other four Toads from the previous game have formed the Toad Brigade. During the Star Festival, Bowser attacks the Mushroom Kingdom and kidnaps Peach, with Luigi and the Toad Brigade getting abducted into space as well, luckily Mario finds the Toad Brigade in the Honeyhive Galaxy and brings them to the Comet Observatory where they, along with the Lumas construct Starshroom spaceships which they use to travel across the universe in order to help Mario find the Power Stars. Banktoad can often be found in certain galaxies where he can usually be seen exploring, digging for coins or helping Mario

Super Mario Galaxy 2
Banktoad has been confirmed to appear in Super Mario Galaxy 2, though it is unknown what role he will play.

Trivia

 * Like Mailtoad, Banktoad wasn't given a name or a real occupation until a Super Mario Galaxy game. In Super Mario Galaxy 2 he was finally given the name Banktoad.