Common Powers
Powers that most if not all ghosts posses in some form:
Flight: The power to defey gravite, and propel them selfs through the air. Flight is one of the most basic powers. Most ghosts (if not all) can fly or float.
Intangibility: The power to phase through all forms of matter, but not allways energy.
Invisibility: The power that causes the ghost to become completly transparent to all forms of vision.
Overshadowing: The power to take over another living (or sometimes not living) things body. Can be resisted by strong will power to an extent.
Ghost Ray: The power dispurse an ectoplasmic energy blast that usually comes out of the palm of the ghost's hand. The colour seems to determine its maximum power.
Paranormal Physical Abilities: Many ghosts posses higher (to the point of superhuman) Strength, Speed, Durability, Agility, Dexterity and Reflexes.