This character was introduced during the Tournament Arc in the first round. She was hostile towards Xiang Ye and the rest of the group at first blaming them for burning her forest down. She could not be defeated, but she became friendly upon discovery of who Isabella actually was.
It was discovered that when they were both younger The Queen of Thorns was the demon queens friend. Isabella planted her in a barren plain, so she could live because the demon territory's mana was too much for her, when they were both children. The Queen of Thorns has not forgotten this favor.
She hates humans, as a whole. The reason has yet to be explained, at least fully. Xiang Ye and his group repeatedly protest their innocence against her claims that they started the forest fire she that she was rightfully angered by, but she's too enraged to believe them.
She controls plants and can manifest in any plant she desires and is practically unkillable when in the proximity of a forest.