Bigger Boo

From the Super Mario Wiki

Bigger Boo was the boss of World 2-4, the third castle in Super Mario World 2: Yoshi's Island. He started as a regular Boo, until Kamek enhanced him with magic, making him grow to colossal proportions. Despite his great size, Bigger Boo was just as shy as any other Boo, and would cover his face if looked at. However, he also turned transparent when looked at, meaning he could not be attacked. To defeat him, the Yellow Yoshi turned away and ricocheted eggs of a wall, hitting Bigger Boo when he was visible. Bigger Boo inflated with each egg that hit him. After enough eggs hit him, he exploded in a brilliant fashion, disappearing from this world.

Yoshi series Enemies
Main Antagonists Baby Bowser | Bowser | Kamek
Minor Antagonists Bessie Bass | Big Bungee Piranha | Bigger Boo | Big Guy the Stilted | Burt the Bashful | Burt Bros. | Cloudjin | Cloud N. Candy | Don Bongo | Gilbert | Hector the Reflector | Hookbill the Koopa | Inviso | Marching Milde | Moltz the Very Goonie | Naval Piranha | Prince Froggy | Priscilla the Peckish | Raphael the Raven | Roger the Potted Ghost | Salvo the Slime | Six-Face Sal | Sluggy the Unshaven | Tap-Tap the Golden | Tap-Tap the Red Nose
Enemy Classes Dudim Phreykunoutonthis | Edibilis Boringus | Harrassimentia Phlyoverus | Mostosti Vomitonus | Projectilia Ritebakatchia | Ucantia Defeatus
Enemies Aerial Snifit | Aqua Lakitu | Bandit | Barney Bubble | Bat | Big Boo | Biting Bullet Bill |Blargg | Blooper | Blow Hard | Bone Dragon | Boo | Boo Balloon | Boo Blah | Boo Guy | Boo Man Bluff | Bouncy | Boss Bass| Bouncing Bullet Bill | Bowling Goonie | Bubble Dayzee | Bullet Bill | Bumpty | Bungee Piranha Plant | Burt | Cactus Jack | Cannibal Guy | Chomp Shark | Clawdaddy | Cloud Drop | Coin Bandit | Crabble | Crazee Dayzee | Crusher Blargg | Dangling Ghost | Debull | Drop Hard | Eggo-Dil | Fat Guy | Flightless Goonie | Flightless Skeleton Goonie | Flopsy Fish | Fly Guy | Frog Pirate | Gabon | Gargantua Blargg | Ghost Piranha | Glide Guy | Gobblin | Gooey Goon | Goomba | Goonie | Green Glove | Grim Leecher | Grinder | Grunt | Gusty | Hanging Blow Hard | Hot Lips | Incoming Chomp | Invisighoul | Koopa | Lakitu | Lantern Ghost | Large Milde | Lava Drop | Lemon Drop | Little Mouser | Little Skull Mouser | Loch Nestor | Lunge Fish | Lure Ghost | Melon Bug | Milde | Mini-Raven | Mufti Guy | Needlenose | Nep-Enut | Nipper Dandelion | Nipper Plant | Parakoopa | Pirate Guy | Piro Dangle | Piscatory Pete | Podoboo | Pokey | Potted Ghost | Potted Spiked Fun Guy | Preying Mantas | Pyro Guy | Raven | Rocket Guy | Seedy Sally | Short Fuse | Shy Guy | Shy Stack | Skeleton Goonie | Slime | Slug | Slugger | Spear Guy | Spike (creature) | Spike (moving obstacle) | Spiked Fun Guy | Spooky | Spray Fish | Spring Plant | Stilt Guy | Stompin' Chomp | Stretch | Tap-Tap | Thunder Lakitu | Tube Guy | Very Goonie | Wall Lakitu | Whirly Fly Guy | Wild Piranha | Wild Ptooie Piranha | Windbag | Woozy Guy | Zeus Guy (Bandit) | Zeus Guy (Snifit)

Boo Characters
Bigger Boo | Boolossus | Boos in Luigi's Mansion | Bootler | Franky | Herbert | Igor | King Boo | Lady Bow | Lahla | Peeka | Spooky Speedster | Stanley | The Creepy Steeple Boo
Boos
Atomic Boo | Balloon Boo | Big Boo | Big & Little Boo | Blindfold Boo | Bomb Boo | Boo | Boo Balloon | Boo Buddy (SMW) | Boo Buddy (YS) | Boo Buddy Block | Boo Buddy Snake | Boo Guy | Boo Man Bluff | Broozer | Calm Fishin' Boo | Circling Boo Buddies | Dark Boo | Dark Dark Boo | Disappearing Boo Buddies | Fishin' Boo | Li'l Boo | Mad Big Boo | Mad Boo | Red Boo | Sleepy Boo | Stretch | Terekuribo