Toad

Toad is a character who is Princess Peach's attendant and a longtime protector of the Mushroom Kingdom. He is actually a singular character among an entire species of look-alikes (much like Yoshi is to the Yoshi), leading to confusion over some of his appearances. He usually has the role of a supporting character who tries to help Mario and Luigi on their adventures, although he occasionally has been a main protagonist, such as in Super Mario Bros. 2, Super Mario 3D World, and his starring role in Wario's Woods. He also appears regularly as a playable character in the Mario spin-offs. His role as Peach's steward has sometimes instead been given to Toadsworth.

History
While often retroactively believed to be one of the Toads in the original Super Mario Bros., the individual character Toad did not debut until Super Mario Bros. 2. In the game, he, along with Mario, Luigi, and Princess Peach go on a picnic at the beginning of the game. As they head out, the four heroes soon discover a cave that leads to the strange world known as Subcon. Upon reaching the mythical area, Toad and his friends then learn that the once peaceful land is now ruled by the tyrannical toad, Wart. Agreeing to stop Wart and bring peace to the land, the quartet immediately set off to defeat the villain and rescue the original inhabitants of Subcon. Toad, Mario, Luigi, and Princess Toadstool eventually defeat the evil tyrant toad after traveling through the mystical land and defeating Wart's army (the 8 bits). Upon Wart's defeat, Toad and his friends then go on to save the people of Subcon, thus bringing peace to the land. At the end of the game, however, it is revealed that the events of the game were just a part of Mario's dream.

Yoshi
Toad and Yoshi are friends they both play sports, racing and party games all the time.