Eina Tulle, a half-elf standing 164 cm tall, possesses brown hair cut to her neck, striking emerald eyes, and characteristic pointy ears, maintaining a slender frame. She typically wears the Guild's black vest over a white blouse, paired with black slacks and thick-heeled boots. Her shift to a short hairstyle followed the traumatic death of an adventurer she advised, an event that deeply affected her. Born to human father and elven mother Aina, Eina has a younger sister, Nina. Leaving home at six to study in the School District, she excelled academically, graduating with exceptional achievements including proficiency in sacred hieroglyphs—a skill mastered by fewer than 10% of students, earning her lasting recognition. At fourteen, she joined the Guild in Orario to support her family, specifically her mother's medical expenses. Initial enthusiasm waned after witnessing adventurer fatalities, hardening her resolve to protect those under her guidance. Eina balances seriousness with profound compassion, exhibiting a "big sister" mentality; she openly desired a younger sibling and channels this into protective relationships with adventurers. Professionally calm and erudite, she becomes easily flustered in romantic situations, often blushing intensely. She avoids burdening others with personal issues and gently rejects suitors. Her commitment to adventurer safety manifests in rigorous private lessons nicknamed "Fairy Break" by the Guild, involving demanding tasks like map-drawing and monster strategy memorization. Most adventurers quit; Bell Cranel is the sole known completer. As a Guild advisor, Eina prioritizes minimizing dungeon risks. She initially advised Bell Cranel with a sibling-like dynamic, worrying excessively and providing critical survival knowledge. Their relationship evolved during the Xenos incident when Bell withheld information, causing her to question if she was merely "convenient." This confrontation revealed her romantic feelings, though Bell remained unaware. Later, during a Freya Familia scheme involving memory alteration, Eina's journal entries about Bell nearly broke Freya's charm, prompting Freya to personally reassert control and erase her memories of him. Eina later recovered these memories after the charm collapsed. Her development includes reconciling with Nina, facilitated by Bell. Their relationship had been strained by Eina's early departure for studies and Nina's inability to match her academic feats. After Bell helped them communicate openly, Nina joined Hestia Familia, and Eina supported her new path. In an alternate continuity, Eina married Vahn, becoming his fifteenth partner and later seeking Nirvana to address pregnancy complications. Eina's abilities center on intellect. She retains hieroglyphic knowledge for interpreting adventurer status updates. Later, she acquired Cygnus Canticum, a golden lyre enabling ritual spells that buff allies and debuff enemies over vast distances. Key relationships include Misha Flott, a colleague and childhood friend who teases her about Bell; Riveria Ljos Alf, a Loki Familia executive respected due to her mother's friendship; and Bell, whom she advises, protects, and loves unrequitedly.