Big Boo is an actual character that has appeared in Super Mario World and Super Mario 64. He seems to be a special Boo that seems to follow Mario even with his eyes closed. He has his own Mansion in SM64 known as Big Boo's Haunt. It has a killer piano and a Merry-Go-Round as well as a basement.
- Big Boo is confused with King Boo because in the Europian Version of Super Mario 64 DS, King Boo is called Big Boo which is a seprate character, meaning there would be two Big Boos.
- Big Boo hasn't made any recent appearances in Mario Games.