He looked similar to a dinosaur until he turned into a tiny lizard. He is color red and has horns.
When Mr. Turner drank it, he wished that he didn't have to go to work so he could enjoy more lemonade. The wish then created the Lizard Monster which then proceeded to destroy Mr. Turner's place of business and the rest of Dimmsdale. Later when Timmy wished that everything would go back to normal, the monster turned into a tiny lizard.
A monster similar to him but is dark green appeared in Poltergeeks.