Fairy

Encyclopedia Entry:
This species forms the majority of fairy monsters living in forests. They sport a child-like appearance and behavior, and have a youthful-aura around them. They also love to sing and dance, and are generally harmless toward humans. In fact, humans don’t usually refer to them as monsters. However, beware if they are under the influence of a succubus’ magic, and treat them the same way you would treat a succubus-type monster.