You can transform yourself into a half-transparent ghost that can enter the bodies of people and control them from the inside. You have access to their powers while inside of them as well as your own. You do not have to always control them and can instead just hide inside a person undetectable by any other forms of detection. You cannot possess objects or corpses, only living organisms relatively as small as you or larger. Although you can cram yourself into humans regardless of your size compared to theirs.