From the Super Mario Wiki
“You shaved my life!”
Chef Shimi is a Cheep Cheep chef who works on the Excess Express. As such, Shimi is in charge of preparing all the meals for the train's upscale passengers. His first language is "Cheep-Cheep", so he often uses the wrong words when talking to non-Cheep Cheeps (e.g. "You shaved my life!"). He also often speaks in exaggerated metaphors and avoids any kind of abbreviations. The latter is likely because of his insecurity in using the human language.
During the events of Paper Mario: The Thousand-Year Door, Mario assumes the role of a detective while on the train to discover who stole Chef Shimi's pot of stew. Following a trail of spilled stew, Mario discovers the identity of the culprit. The pot of stew was stolen by none other than Heff T., the obese Toad. Mario returns the pot and Chef Shimi rewards the "detective" with a Star Piece.
Chief Shimi also has a trouble in the Trouble Center. For a special meal, he needs a Mystic Egg, a Golden Leaf and a Keel Mango. Mario had to get the Mystic Egg by playing with Petuni, collect the Golden Leaf behind the Creepy Steeple, and get the Keel Mango from a tree in Keelhaul Key, and then bring the ingredients back to Shimi for his reward.
Chef Shimi's name comes from a shortening of "sashimi," the Japanese name for a type of a raw fish dish. Chef Shimi is stated to be quite good at cooking by characters such as the Toad Waitress, although it's a minor running joke in Paper Mario: The Thousand-Year Door that he is unable to cook with anything but Mushrooms. (He seems, however, oblivious to this, greatly hyping up seemingly repetitive dishes such as the "Mushroom Full Course".)
Names in other languages