Encyclopedia Entry:
A type of fairy with a peculiar personality. It lives in forests with other kinds of fairies, but a few are also known to change into human form and live in human settlements from time to time. It loves works of art like pictures, music, and stories. Charmed by those, it appears before humans.
They have a unique diet. They are fueled by touching great works of art. Also, they are very aggressive in romantic pursuits. When they find a male artist they like, they will actively try to seduce him. They have the body of a little girl, but a subtle charm magic is always being released from their body, so the men they target always feel extremely attracted to them. It is extremely difficult to elude their seduction. Also, a certain number of Leanan Sidhe have been twisted by the influenced of the succubi, causing them to turn violent. So there are some who will assault men, forcing intercourse.
A man who has sex with a Leanan Sidhe has his creative abilities and talents for art skyrocket. Thanks to this power, most such men have become rich and famous. However, their minds are gradually twisted by the charm magic. Eventually, they can think of nothing other than her, and producing works of art to give to her. Eventually, the fame brought by their works becomes a curse, and they go off somewhere with her and disappear. According to one explanation, they have been taken away to the “Kingdom of Fairies.” It is said that once there, they will produce works of art for her, and continue to make love exclusively.