Fourteen is a poorly-drawn Arabic numeral fourteen (using the "open" version of the symbol four). They have a green body and limbs that are more lightly-colored. Fourteen is a kind of "psychopathic maniac with a smile on their face", if based on the fact that they happily ran to eat people's skin. They seem to be naive and excitable, and likely not understanding that "Eating people's skin" is bad. He is a prankster