Mr. Bones

Skeleton Ghosts are, as their name implies, skeletal ghosts appearing only in the game Luigi's Mansion. A skeleton ghost named Mr. Bones is first encountered in the Boneyard where it was disturbed by Spooky's barking. They attack by throwing bones at Luigi. Skeleton Ghosts were also found in the Graveyard and had to be defeated to lure out Bogmire. More Skeleton Ghosts were encountered in the Telephone Room. These ghosts have thirty HP. To defeat them, Luigi would have to catch one off guard. They are not stunned by the flashlight normally. Luigi must wait until they throw a bone at him. After doing so, the Skeleton Ghost will collapse into a pile of bones, move somewhere else, and rebuild itself before throwing another bone at Luigi. It is only during the process of rebuilding themselves that skeleton ghosts are vulnerable to the flashlight. Skeleton Ghosts could also, like all other normal ghosts, be defeated by one of the three Elements.

Trivia

 * Skeleton Ghosts are similar to another skeleton enemy, Dry Bones, as they are both undead and attack by throwing bones. However, Skeleton Ghosts resemble a small human skeleton, rather than a Koopa.
 * Mr. Bones, the Skeleton Ghost in the Boneyard, is the only Skeleton Ghost who can talk. He is also the only non-Portrait Ghost or Boo to speak.
 * Skeleton Ghosts closely resemble Skellobits.
 * It is implied that Boneheads from WarioWare, Inc.: Mega Microgame$! are large Skeleton Ghosts.