The Thriller Wolf's fur is coloured black, with a black afro. It has three long, sharp, white claws on each foot. Its eyes are completely yellow, and its mouth has six white teeth pointing out of its upper jaw. It wears a red and yellow baseball bomber jacket, with the block letter 'M' on its back and the left breast. A pair of navy blue pants makes up the rest of its clothing.
The Thriller Wolf is a direct reference to Michael Jackson's song 'Thriller'. This relates to Halloween in that the song is about horror themes. Thriller relates back to a wolf in that Michael Jackson transforms into a werewolf in the music video, which can be viewed here.
The description is a reference to the last two lines of the song, which is "no mere mortal can resist / the evil of the thriller".
The clothes that the Thriller Wolf wears are the same as what Michael Jackson does in the video.
The description contained an error in which "Thriller Wolf" did not contain any capital letters.
This was corrected in version 1.15.0 on the 22nd of March 2018.
The Thriller Wolf's XP was changed on the 21st of June 2018 in version 1.18.0. The original XP was 25.