Mackenzie's mushroom pet, Funghi (Nameko in Japan) became a widely popular character in Japan, and has gained his own branch series of muchroom based games. He is now the main face of the "Touch Detective" multi-franchise.
Mackenzie's motto is, "once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth". This motto comes from The Adventures of Sherlock Holmes, and it's famous titular detective.