Michael Theodore Mortimer "Mickey" Mouse is a leader of Disney World/drug dealer who is addicted to drugs. Despite common belief, he did NOT host American Idol Mario Edition, that was Mickey Seacrest, an old and different version of him.
As the Disney mascot, whether or not he actually is the Mickey Mouse from Disney, or he just portrays Mickey just like the South Park version, he is a TV Personality.
Mickey Mouse is a greedy drug addict. He outright forces Bowser Junior to buy two bottles of water for $40 to get richer. He also is extremely addicted to drugs, owning a meth lab (although it was burned down).
In Bowser Junior Goes To Disney World! Part 2 he brings the Brooklyn Guy to Chef Pee Pee's hotel room and hid him in a fridge. Then he did cocaine in the room with Goofy and asked Chef Pee Pee if they could crash in his bathroom for the night. The next day Mickey finds Goofy dead and tries to give him Cocaine to revive him to no effect. He dumps Goofy's body in a bush and then leaves the hotel.