Avenging Spirit

In Avenging Spirit the player must rescue the protagonist's girlfriend, but since the character has been turned into a ghost, he needs to grab other character's bodies to progress.

You have been deep sixed by gangsters and turned into a ghost. To make matters worse, the mob has kidnapped your girlfriend and is holding her for ransom, they want the secret of ghost energy. To rescue her and get even with the mob, you must inhabit any one of 20 different creatures and search for your girlfriend on 6 dangerous levels. So grab a body, any body, make a beeline to the big rescue, and rescue your dollface.