WARNING: This is a LOOOOOOOOOOOOOONG post.
Boo
Big Boo
Bigger Boo
Atomic Boo
BaBoon
BamBoo
Big Boo (the Luigi's Mansion character)
Boo B. Hatch (a play on words)
Boo B. Trap (another play on words)
Boo Boo
Boodacious
Boodonkulous
Boofant
Boofoon
Booger
Boogie
Boogie Woogie
Boohemoth
Boohoo
Booigi
Boo La La
Boolderdash
Booldog
Boolean
Boolicious
Booligan
Boolivia
Booluga
Boolossus
Boomeo
Boomerang
Boonita
Boonswaggle
Boopa Troopa
Boony Raboot
Booregard
Booreaucrat
Booripedes
Booris
Booscaster
Boo Stack
Bootine
Bootique
Bootha
ComBooter
French Boodle
GameBoo
GameBoo Advance
GumBoo
JamBoolaya
King Boo
Kung Boo
Limbooger
Little Boo Peep
MamBoo
MaraBoo
Mr. Boojangles
Ooga Booga
ParaBoola
PeekaBoo
ShamBoo
Spooky Speedster
TaBoo
TamBoorine
The Big Boo
TurBoo
UnderBoo
Unnamed Boo
Black Boo
Green Boo
Red Boo
Balloon Boo
Big & Little Boo (which seems redundant)
Blindfold Boo
Bomb Boo
Boo Balloon
Boo Buddy Block
Boo Buddy Snake
Boo Buddy Swarm
Boo Guy
Boo Man Bluff
Calm Fishin' Boo
Circling Boo Buddies
Dark Boo
Dark Dark Boo (which also seems redundant)
Disappearing Boo Buddies
Eerie
Fishin' Boo
Ghoul Guy
Jelly Ghost
Lil' Boo
Mad Big Boo
Mad Boo
Mini Boo
Octoboo
Peepa
Sleepy Boo
Stretch
Tail Boo
Terekuribo (more like Goomboo)
I defeated all of these Boos by scaring them to death! How, you ask? Well, let's just say it was a piece of cake. Why? Because Boos are deathly afraid of Wario!
