Ugmons (ブサモン, Busamon) are an unusual type of Mysterious Beings created from ugly humans.
Ugmons are formerly ugly humans, who have become monsters due to bullying, or from being turned down by the opposite sex. The feelings of jealousy or inferiority turn into hatred, covering their hearts with darkness dyed with evil. Their strength after turning into monsters is influenced by the hideousness of their hearts.
They are able to grow in size and rearrange their body parts.