Starshroom

The Starshroom is a mushroom-shaped starship found in Super Mario Galaxy. After Mario rescues the Toad Brigade in the Honeyhive Galaxy, they relocate their base of operations to the Garage of the Comet Observatory and start building the Starshroom with the help of the Lumas.

Once Mario recovers seven Power Stars, the Starshroom will be fully constructed, and can later be seen exploring many different galaxies, including the Space Junk Galaxy, the Ghostly Galaxy, and the Sweet Sweet Galaxy. The Starshroom also appears to resemble Princess Rosalina's ship, and was presumably modelled after it.

At first, there only appears to be a single, red Starshroom. However, as the game progresses, four additional Starshrooms, all color-coded for the rest of the Toad Brigade can be seen at certain points, such as during the Purple Coin challenge in the Sea Slide Galaxy.