Clownpiece
Race: Fairy
Power: To drive people insane
A subordinate of Hecatia. Fairies generally live in places. Naturally, Hell is no exception. However, the Lunar Capital rejects both life and death and excludes fairies. There aren't many fairies nearby.
She was ordered by Hecatia to take a bunch of fairies to the Sea of Tranquility. Along with her companies, they were converting the Sea into fairy territory. Then they were awakened by Junko's power. She was a being of pure lifeforce.
She told them: "As long as you're here, the Lunarians can't lay a hand on us. As long as none of them are willing to purposefully approach impurity, they'll stay confined."
And then they played a lot.
The surface of the moon is a desolate place, but compared to Hell it's quite beautiful, so they considered it a fun world. The fairies made merry.
After a long time without a hint of activity from the Lunar Capital, a lone human came flying out of it. They had been told "If anyone comes from the capital, do whatever you like", so they were in the highest of spirits."