Toad, known in Japan as Kinopio, is a fictional humanoid mushroom that is both a single character, and the collective name of the "Mushroom People" found in the Mushroom Kingdom. The Toad species first appeared in Super Mario Bros. as seven guards that serve Princess Peach, called Mushroom Retainers.
Toad is known for being the long time servant, and attendant of Princess Peach. He constantly tries to protect her; however, he prominently fails.So almost every time during the events of her kidnapping. Despite his cowardice, Toad is notable for being one of the few characters who help the Mario Bros. through a variety of different ways throughout their adventures. Toad has even made his own fair share of heroic contributions as seen in games such as in Wario's Woods (a game that features Toad himself as the main hero) and Super Mario Bros. 2.
Blue Toad is one of the four playable characters that appear in New Super Mario Bros. Wii with Yellow Toad, Mario, and Luigi. Blue Toad bears the same abilities as the Mario Bros. and Yellow Toad, and items affect him in the same way.