These are the different types of Boo.
“Dark Boos are purple Boo-like enemies appearing in Paper Mario: The Thousand-Year Door, Super...Dark Boo
“Boo Guy is variation of the common Mario foe Shy Guy. It appears to be a dead Shy Guy and can't...Boo Guy
“Anuboos are a sub-species of Boo that appears in Mario& Luigi: Superstar Saga in Teehee Village...Anuboo