Notes:

Name: Nancy
Species: Leanan-Sidhe
They have the body of an adult female, a rarity among fairies. They try to help develop the talents and abilities of those they favor. "I've heard she's quite a fan of music!"

First time I've seen their name written in katakana, had to google it to figure out what she was even supposed to be. Nancy seemed to be the closest fit for her name, but it is a pun on her species again.

Name: ナンシー (Nanshii)
Species: リャナンシー (Ryananshii)

thanks to the /a/non who did the above work