Shizutou Mochiya

She is a polite, modest, and knowledgeable Illuminator and is able to answer many uncommon questions. Although she is the most frequently relied-upon Arboranger in Earthcaress Beacon, almost no one has seen her fighting. Generally, she is only responsible for strategizing and planning.

Spoiler

Long ago, in order to save the dying Lanteria, Tranquillia transferred her soul into a newborn Illuminator: committing this sin was a "necessary evil" for her.