She is a beautiful woman who appeared to be in her twenties, according to human standards. Her skin was light with well defined facial features. She was stated to be semi-transparent.
Forest Disturbance Arc
She met one of Souei's clones during his investigation of the orc army, and insisted that she meets Rimuru. She later made her appearance in a meeting, where she confirmed the presence of an Orc Lord and asked Rimuru to defeat it.
After the battle between Rimuru and the Orc Disaster, a conference was held to determine the fate of the orcs. Treyni attended the conference as a representative of the Treants. The Great Forest of Jura Alliance was soon established, and she appointed Rimuru as their leader. Treyni and the Treants offered to provide food supply for the orcs.
She has the ability to manipulate the magic power of nature.
She has a teleportation skill, that looks like Spatial Travel, its invocation is quick.
- Ramiris: She was always waiting for Ramiris to reincarnate. And was not aware of never think that the Fairy Queen had become one of the Demon Lords, until being informed by Rimuru. She then became her subordinate.