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. They also like to play practical pranks on others, for example, to put gum on the road along which Five is walking or write insults on playing cards depicting the Algebrailiens or put in front of Six a fake look that they will portray.