Norn Clatalissa Jioral

Norn Clatalissa Jioral, now known as Ellen, is the second princess of Jioral Kingdom, and younger sister of Flare. She is cold and calculating, Norn is the one of the most sadistic individuals among the Jioral Kingdom, which even unnerves her fellow companions.

Norn's tactical prowess makes her stands out among others in Jioral Kingdom, and is enough for Keyaru to regard her as a dangerous and risky target of revenge.

In the first timeline, she led a large-scale subjugation of demon territory with great success. She was nearly successful with the extermination of demons in Buranikka, had it not been for Keyaru's countermeasures.

After being brainwashed and having her memories wiped by Keyaru, Ellen (Norn) is completely subservient to Keyaru, whom she regards as her older brother.
(Source: Kaifuku Jutsushi no Yarinaoshi Wiki)