Alleyne is a millennium-old forest elf who serves as her tribe's chief warrior, renowned as "Fighting Master" for her vast combat expertise and stern demeanor. Reserved and disciplined, she habitually evaluates others' performance with numerical scores during training and battles. Her appearance features platinum blonde hair, blue eyes, pointed ears, and distinctive attire: a clover-patterned red beret, red-and-gold cloak, green elven garments, and thigh-high boots.

Initially bound to her forest, Alleyne's life changed upon encountering Nowa, a half-elf rejected by both races. Despite Elf Council reluctance, Alleyne appointed Nowa as Forest Keeper, becoming her mentor and developing deep, unspoken affection. When the Council exiled Nowa by forcing her into the Queen's Blade tournament, Alleyne defied orders and secretly left the forest to protect her.

After the tournament, Alleyne returned to her forest, later destroyed by the Swamp Witch's forces, resulting in her tribe's genocide. The Swamp Witch also cursed her with a "Confinement Curse," magically binding her to the forest. During this isolation, she encountered Annelotte, a fugitive from Queen Claudette's regime. After tending Annelotte's injuries and witnessing her demonic powers manifest in a storm, Alleyne accepted her as a second disciple, beginning a new mentorship chapter.

Alleyne shares a long-standing dynamic with veteran mercenary Echidna, marked by mutual respect laced with tension; Echidna mocks Alleyne's inexperience with romance, while Alleyne disapproves of Echidna's free-spirited methods. Alleyne employs staff-based combat techniques—"Eagle Talon," "Tornado Strike," and "Hurricane Fury"—leveraging agility and unpredictability honed over centuries.