|This article is about a/an deceased character in Power Rangers Mystic Force.|
Niella was the Gatekeeper of the Underworld and Udonna's older sister. She played and important role in the Great Battle assisting the Mystic Wizards during the fight. When Leanbow went into the Gates, he told her to seal the Gate with a spell that ultimately took her life. Only her daughter remains. Like Clare, Niella had an Ancient Mystic Mode dubbed the "Shining Moon Warrior". She was also Nick's maternal aunt and Leanbow's sister-in-law through Leanbow's marriage to Udonna. According to Udonna, Niella was a great and a powerful sorceress, but was a bit clumsy at her beginnings just like Clare was in her apprenticeship. Leanbow and Daggeron said that she was a great friend, Udonna misses her sister very much but she says that she is always in her heart. Niella, like Clare, was portrayed by Antonia Prebble.
- Udonna - Younger Sister
- Clare - Daughter
- Nick Russell - Nephew
- Leanbow - Brother-in-Law
- unnamed husband - Husband
- No mention is made of Niella's husband or whether or not he played a part in the Great Battle.