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Boom Boos, also called "Booms" and "Boos" are a group of monstrous ghosts ruled by King Boom Boo and enemies in Sonic Adventure 2. They have appeared in Sonic Adventure 2: Battle, Sonic Runners and Sonic Lost World. They also made an appearace in the anime show Sonic X and it's comic book adaption of the same name by Archie Comics.
The Boom Boos/Boos have white round bodies with thin hands and two small sharp ends below their body For facial features, they have black soulless eyes and a closed linear mouth which looks like it is knitted up. However, the Boom Boos are about three times larger than the regular Boos.
When shrunk down in Sonic Adventure 2, the Boom Boos' appearance changes to that of attack-type Boos. As such, they gain red and orange colored maniac eyes with black pupils and their mouth opens, revealing black, sharp teeth. They also gain 3 points on their hands and the 2 ends below their body are transformed into one.
Similar to their King, the Boom Boos are mischievous and malicious, giggling and laughing whenever they are causing trouble. They are capable of ferociously possesses people and attacks their prey without warning quickly and unexpectedly.
- Their alias is the name of the Boos ruled by King Boo from the Super Mario Bros. series.
- Before Sonic Adventure 2, there have been similar ghost-like enemies called "Hyudoros", which act similarly like Boos and are featured inside the pyramid at the second act of Sandopolis Zone in Sonic & Knuckles. Despite these facts, both Boos/Boom Boos and Hyudoros can be consider as separated ghost species.