A person who tries to utilize as much power or authority as possible. This trait is often found in people who actually have little or no power. Therefore, utilizing the "Power Sucking" mindset, they try to hog as much power as possible. Sometimes found in substitute teachers.
Person 1: You can't do that!
Person 2: Why not?
Person 1: Because I said so! And I am fictionally powerful.
Person 2: You must be a power sucker.