When Luigi first encounters Boos in the Storage Room, he returns to Professor E. Gadd's lab. E. Gadd upgrades his Game Boy Horror, so that it has a device that scans where the Boos are found in each room. Luigi finds 50 Boos (51 Boos including King Boo) throughout the mansion (15 make up Boolossus). Each Boo is a parody name, one of them notably is Game Boo Advance, obviously a parody name of the Game Boy Advance.
Floor One[]
- BamBoo
- Boolicious
- Bootha
- GameBoo Advance
- TaBoo
- TurBoo
Floor Two[]
- Boo La La
- Boodacious
- Boogie
- Booligan
- Boomeo
- GameBoo
- GumBoo
- Kung Boo
- PeekaBoo
Floor Three[]
- Boohoo
- Booigi
- Boonswoggle
- Booregard
- Booris
- LimBooger
- Little Boo Peep
- Mr. Boojangles
- ShamBoo
Floor Four[]
- Boo B. Hatch
- Booffant
- Boolderdash
- Boolivia
- Boomerang
- Boonita
- Booripedes
- Booscaster
- Bootique
- TamBoorine
- UnderBoo
| Boos | ||
|---|---|---|
| Characters | ||
| Big Boo • Bigger Boo • Black Boo • Boolossus • Boos in Luigi's Mansion • Boos in Luigi's Mansion: Dark Moon • Bootler • Franky • Herbert • Igor • King Boo • King Boo (Super Mario Sunshine) • Lady Bow • Lahla • Peeka • Spooky Speedster • Stanley • The Creepy Steeple Boo | ||
| Species | ||
| Atomic Boo • Balloon Boo • Big Boo • Big Boo (Paper Mario) • Big Frame Boo • Big & Little Boo • Blindfold Boo • Bomb Boo • Boo • Boo Balloon • Boo Block • Boo Buddy Snake • Boo Buddy Swarm • Boo Guy • Boohemoth • Boo Man Bluff • Boo Stack • Calm Fishin' Boo • Circling Boo Buddies • Dark Boo • Dark Dark Boo • Disappearing Boo Buddy • Eerie • Fishin' Boo • Frame Boo • Ghoul Guy • Gold Boo • Green Boo • Li'l Boo • Mad Big Boo • Mad Boo • Mini Boo • Octoboo • Peepa • Polterguy • Red Boo • Shiny Boo • Sleepy Boo • Snufit • Stretch • Tail Boo • Terekuribō | ||
