A Boomie is a mouse-like monster that explodes after a set amount of time elapses. Once it starts glowing and flickering, it will explode and will destroy anything that is near the impact. However in Klonoa: Empire of Dreams and Klonoa 2: Dream Champ Tournament, it doesn't glow and flicker. When grabbed by the wind bullet, it will trigger a timer above it and when the timer runs out, it explodes. There's also a flying variant of it.