Case Closed. You don't need a video game to be popular. Siren Head just happened to get one because of a fan, and he has a song which was made by CG5(recommended)and it ups his popularity even further.

Description: Created by Trevor Henderson and with all of his history being wiped from the internet Cartoon Cat is a very mysterious character with unknown origins.As he grows closer to his victims an aura of music will pulsate around cartoon cat like sound waves which can be heard by his prey when he/she is spotted. Like in old cartoons he can Bend his body parts in many different ways and extend them to a very far distance to better catch his victim or to break their focus.