Bigger Boo

Bigger Boo is the boss of World 2-4, the third castle in Super Mario World 2: Yoshi's Island. He is found in World 2's fort. 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 intangible when looked at, meaning he could not be attacked; obviously, this also meant that he could not damage the player. To defeat him, the Yellow Yoshi had to turn away and ricochet eggs off a wall, hitting Bigger Boo when he was visible. Bigger Boo inflated with each egg that hit him. Also, Fangs floated all over, which Yoshi could eat for eggs. After enough eggs hit him, Bigger Boo exploded.

Trivia

 * Bigger Boo gets his name from the Super Mario World enemy and boss, Big Boo/The Big Boo.