Eliza, first princess of Waleland, possesses thigh-length red hair, blue eyes, and stands 162 cm tall. She cultivates a bright, mature public image, achieving immense popularity and earning the titles "Crimson Diva" and "Scarlet Songstress" through her dual role as a magical girl and idol. Privately, she harbors a competitive spirit, despises losing, and indulges a secret passion for exploring towns in disguise to experience commoner life. This hobby involves collecting disguises, though her iconic red hair often makes them unconvincing.

She led the legendary idol unit Ray, famed for integrating magic into their performances via the unique "Aria" technique. Ray disbanded three years ago following Eliza's career-ending injury: her voice suffered irreparable damage after using the Aria technique first to eradicate magic beasts threatening Ryuuto (Yue's hometown) and then, without recovery, to cure her younger sister Tiara's chronic illness. This sacrifice forced her reliance on a vocalizer device and caused Ray's dissolution. Former members pursued separate paths, like Chloe becoming Flora Girls' Academy's director and Ange joining Sadistic★Candy as Angelica.

Eliza exhibits intense protectiveness towards Tiara, having doted on her during childhood illnesses. After Ray disbanded, she adopted an aloof demeanor towards Tiara to deter her from becoming a witch, fearing the dangers of a magical life. This included secretly sabotaging Tiara's academic progress at Flora Girls' Academy to force her return to Bristol for safety. Despite her cold exterior, she acts as a mysterious protector, using disguises to observe and guide students—including Tiara's unit, LiGHTs—as part of her expulsion scheme.

In combat, she wields wind-based magic and a magic-constructed whip. Her abilities encompass spell disruption, such as countering sleep magic, and generating gale-force winds. She also employs anti-magic defenses, demonstrated by blocking Lynette's forced-sleep spell. Beyond royal duties, she actively defends allied regions, mentors younger witches like Yue, and intervenes in crises, like permitting trespassing students to reunite with Tiara despite security risks.

Eliza's relationships are pivotal: she shares a close bond with former roommate Chloe, a contentious dynamic with Tiara rooted in overprotectiveness, and a mentorship with Yue. Her actions, including her voice sacrifice and behind-the-scenes guardianship, highlight a commitment to duty and loved ones, even when misguided. Currently, she focuses on royal obligations while intermittently monitoring academy affairs, maintaining her legacy as a former idol and protector.