Sora

Sora (ソラ), a dryad from the Spirit Tribe, was given the job of protecting the forest and safeguarding the Shield Of Truth. She gave the shield to Rein and others after they told her it is needed to defeat the demon lord. Noticing that she is sad, Rein asks her to tell the reason. Sora told Rein and others that his sister was captured by Shadow Knight as an offering to protect their village. Rein helped her and her sister by defeating Shadow Knight. Then, Sora, along with Luna, decided to join his party, making them his third and fourth contractual.

She's one of the main heroines of Beast Tamer series.

Appearance
Sora is a spirit of short height. Though her real age is over 200 years old, she's likely to mistake him for a child. Despite his appearance, he has a dignified expression, and although she is contradictory, she looks somewhat mature. Her flaxen hair was tied up in floral ornaments. As a spirit, on her back, a pair of glowing light feathers that Sora can easily camouflage from the humans after she joined Rein's party.