Araya Endō commands significant respect at Yurigaoka Girls' Academy as one of its most skilled Phase Transcendence users. Her natural Magie supply rivals that of a boosted Lily, marking her among the academy's elite talents. This exceptional power earned her an invitation from Shinobu Izue to join Legion Brynhildr, yet she declined, opting instead for membership in Alfheim alongside Ichi Tanaka and Kusumi Egawa.

She maintains an openly flirtatious demeanor toward fellow female students, a frequent topic of campus gossip. Her advances focus particularly on Riri Hitotsuyanagi, pursued with notable persistence after witnessing Riri's combat abilities. This pursuit includes initiating physical contact, such as touching Riri's chin during interactions.

Her family background includes a father working as a philosopher and a mother who teaches art at Tokyo University of the Arts. At Yurigaoka, she shares a room with Tatsuki Mori.

In combat, she commands her CHARM with proficiency, engaging Yuyu Shirai in a campus duel. This confrontation was halted by Kaede Johan Nouvelle, preventing further escalation. Her actions demonstrate confidence in her abilities and a readiness to test her strength against formidable opponents.