Complex sentence: In most Slender Man related media, he seems to have the ability to change his height and always appear taller then his victim, very skinny, faceless, and wearing a black suit with either a black or red tie.
Split into simpler sentences: In most Slender Man related media, he seems to have the ability to change his height. However, generally speaking, he appears taller than his victim, very skinny, faceless, and wearing a black suit with either a black or red tie.