Mini Boos, also named Little Boos, are a small variation of Boos which first appear in Yoshi's Story.
In Yoshi's Story[]
Little Boos, as they are named for the game, are enemies encountered in Ghost Castle. They can be found in groups. If a Yoshi throws an egg at one of them, the Little Boos stop moving and swoop at Yoshi. It is impossible to defeat Little Boos entirely, as more just appear from off-screen. If Yoshi eats a Heart Fruit and does a Ground Pound near Little Boos, they turn into Lucky Fruit, much like Shy Guys do.
In Mario Power Tennis[]
Boo's Offensive Power Shot, Boo Blast, has him summon several Little Boos to form into a large tennis racket, hitting the ball with it, then allowing them to cloak the ball, although it is still possible for the receiver to return the ball.
In Super Mario Galaxy[]
Transparent Little Boos can be found at Ghostly Galaxy, on the Boo Race Goal Planet during the mission A Very Spooky Sprint. They are not enemies, and only come a short distance from the planet's surface before disappearing.
In Mario Super Sluggers[]
Mini Boos are featured as an item. Using a Mini Boo makes the ball invisible for about six seconds. The ball is still tangible and can be caught. In Challenge mode, Mini Boos are found in the map for Wario City, and are required for King Boo to join the player's team.
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| Characters | Protagonists | Yoshi • Yoshis |
| Antagonists | Baby Bowser | |
| Supporting characters | Balloon Bully • Dragon • Ghost Rider • Huffin' Puffin • Miss Warp • Neuron • Poochy • Power Bee • Snake | |
| Levels | P. 1-Beginning | Treasure Hunt • Surprise!! • Rail Lift • Tower Climb |
| P. 2-Cavern | Bone Dragon Pit • Blargg's Boiler • Jelly Pipe • Torrential Maze | |
| P. 3-Summit | Cloud Cruising • The Tall Tower • Poochy & Nippy • Frustration | |
| P. 4-Jungle | Jungle Hut • Jungle Puddle • Piranha Grove • Neuron Jungle | |
| P. 5-Ocean | Lots O'Jelly Fish • Lots O'Fish • Shy Guy Limbo • Shy Guy's Ship | |
| P. 6-Finale | Mecha Castle • Lift Castle • Ghost Castle • Magma Castle | |
| Other | Practice (training level) | |
| Bosses | Bosses | Cloud N. Candy • Inviso • Cloudjin • Don Bongo • Baby Bowser • Ghost |
| Mini-bosses | Bone Dragon • Slug | |
| Enemies and objects | Enemies | Air Bag • Attacky Sack • Bamboo dancer • Bee • Big & Little Boo • Black Shy Guy • Blargg • Blindfold Boo • Blue Blurp • Bob-omb • Bone Dragon • Boo • Boo Block • Bullet Bill • Bumblebee • Bumpty • Burner Shy Guy • Centipede • Cheep Cheep • Chomp • Clam • ComBat • Do-Drop • Flying Shy Guy (propeller) • Frog • Fuzzy Wiggler • Gabon • Goonie • Ick Worm • Jellyfish • Jelly Ghost • Lakitu • Lava Ghost • Little Boo • Mr. Eel • Nipper Plant • Nipper Spore • Pak E. Derm • Peeper • Piranha Plant • Piranha Pest • Piranha Sprout • Puffer • Raven • Red Blurp • Sea Anemone • Sea cactus • Sensuikan Heihō • Shy Guy • Shy Guy Galleon • Shy Guy on Stilts • Shy Guy on Pogo Sticks • Snorkel Snake • Snow Guy • Spider • Spike • Spiked Fun Guy • Spiny Fish • Tehee Butterfly • Toady • Vine Slime |
| Objects | Bocci Ball • Bumper Ball • Burner • Direction Switch • Grinder • Jelly • Piston • Rail Lift • Spike • Spiked stone • Sword | |
| Items | Items | ? Bubble • Bumber 'Chute • Delay Switch • Heart Coin • Message Block • Mystery Crate • Power Flower • Special Heart • Super Happy Tree • Surprise Ball • Tulip • Warp Vase • Yoshi's egg |
| Fruits | Apple • Banana • Bomb Berry • Favorite Fruit • Grapes • Heart Fruit • Lucky Fruit • Melon • Pepper • Watermelon | |
| Miscellaneous | Moves | Crouch • Egg Throw • Flutter Jump • Ground Pound • Jump • Sniff • Swallow |
| Terminology | ♥ • Arrow Sign • Fruit Frame | |
| Other | Gallery | |
