Pennington

Pennington (or, as he prefers to be called, The Penguin with The Improbably Large Brain) is a Bumpty detective from Poshley Heights in Paper Mario: The Thousand-Year Door. Mario first meets Pennington on the Excess Express, where he takes Mario under his wing (so to speak). Pennington and Mario must solve the many mysteries that occur on the train. Of course, Mario solves all the mysteries with no help from Pennington.

When the Excess Express arrives in Poshley Heights, Mario heads to Poshley Sanctum to find the Garnet Star. However, the sanctum curator is unavailable and the entrance is locked. However, Pennington soon arrives and unlocks the door, revealing that his real profession is being the manager of the sanctum. Being a detective is just a hobby of his.

Although he is the curator of the sanctum, he does not know where the Garnet Star is located. The only item on display is a replica of the Garnet Star, probably to protect the real star from falling into the wrong hands.

Although Pennington claims to be a great detective, he constantly mistakes Mario for his brother Luigi.

When everybody is cheering Mario on when he's fighting the Shadow Queen, Goldbob, his family, and Toodles are cheering him on, they call him Gonzales and his own name. Which causes Pennington to be surprised and asks if it's Mario or Gonzales. Even after Mario beats the Shadow Queen and returns to Poshly Sanctum, he first calls Mario Luigi again, but quickly corrects himself.