These undead wanderers inhabit dark pyramids, barren canyons, derelict pirate ships, and other places the living are not likely to frequent. They have no allegiance to Sonic, Eggman, GUN, or any other party and will attack without discretion.

:: Ghosts ::

Boo ブー There are two types of Boos: normal Boos are tiny, harmless ghosts that scurry along the ground or sit and hide until approached. Step too close and they explode in your face, which startles and momentarily stuns your character, but doesn't inflict damage. Attack type Boos are larger, wild-eyed ghosts that attack directly or hold you in place so nearby robots can do the dirty work. :: Sonic Adventure 2 Boom Boo ブーブ Giant Boos that float around menacingly. Smack them once to reduce their size and again to shrink them down to normal attack type Boos. Land 1 more hit (total of 3) to send them back to the afterlife. :: Sonic Adventure 2 Egg Golem エッグゴーレム This giant stone statue is guardian of the pyramid Eggman decided to use as his base in Sonic Adventure 2. Eggman used a mind-control device to keep the brute under his command, but after Sonic smashed the brainwashing headgear, the golem went berzerk. :: Sonic Adventure 2 Guardian ガーディアン A stone golem guarding the entrance to a large Sandopolis pyramid. He is slow and incredibly stupid - just lure him into the pool of quicksand on the left side of the arena for an easy win. :: Sonic & Knuckles Hyudoro ヒュードロ These ghosts inhabit the pyramids of Sandopolis. They hover harmlessly in the air until the lights go out, then attack en masse. They can be momentarily scared away with a spin, but only turning on the lights will curb their assault. ("Hyuudoro" is the sort of wailing noise a Japanese ghost might make.) :: Sonic & Knuckles | Sonic Rivals 2 King Boom Boo キングブーブー King of ghosts inhabiting Eggman's pyramid base in Sonic Adventure 2. He flings ghostly fireballs and can't stand sunlight. :: Sonic Adventure 2 No image Skeleton スケルトン Legless skeletal pirates that hover around their abandoned ship and fling bones at intruders. :: Sonic Rush Adventure No image Skull Fire スカルファイアー Large, blue flame skulls that shriek around the air and latch onto intruders. They don't inflict damage, but slow running speed as long as they're attached. Shake them off with a Super Boost or just wait until they let go of their own accord. :: Sonic Rush Adventure No image ??? Malicious copycat ghost from Mystic Haunt that mimics Sonic and Tails' appearances. :: Sonic Rivals 2