The Possessor is a fictional character appearing in publications from Marvel Comics. The character is one of the Elders of the Universe. His name comes from his self-given title Possessor of the Runestaff, a powerful alien artifact.
One who possesses; one who occupies, holds, owns, or controls; one who has actual participation or enjoyment, generally of that which is desirable; a proprietor.
a person who owns something; "they are searching for the owner of the car"; "who is the owner of that friendly smile?"