Eina Tulle is a half-elf serving as a receptionist and adventurer advisor for the Guild in Orario. Her mother, the elf Ain, struggles with poor health outside elven forests, necessitating financial support which led Eina to seek the Guild's stable income. Her human father and younger sister, Nina Tulle, complete her family. Leaving home at age six, Eina studied at the School District, achieving top grades and mastering rare skills like hieroglyph interpretation—a divine language with less than 10% student proficiency. Her academic excellence remains renowned years later. She joined the Guild at fourteen and has worked there for five years. Eina possesses shoulder-length brown hair, emerald eyes, and pointed ears marking her heritage. She presents professionally, typically wearing the Guild uniform: a black vest over a white blouse, black slacks, and heeled boots. Her hair was long until cut short following the traumatic death of her advised adventurer Maris Hackard, a constant reminder of dungeon dangers and her duty to prevent such losses. Serious, responsible, and introverted, Eina meticulously adheres to Guild protocols. Deeply committed to protecting her adventurers, she conducts rigorous private lessons nicknamed "Fairy Break," involving demanding tasks like dungeon mapping and monster strategy memorization. Most adventurers abandon these intense sessions early, with Bell Cranel being the only known completer. Despite stern professionalism, she harbors a protective instinct toward "unreliable" individuals, finding them less intimidating than capable ones. This draws her to those needing guidance. She avoids romantic advances to prevent hurt feelings and becomes visibly flustered by romance discussions. Her initial relationship with sister Nina was strained due to minimal in-person contact during upbringing, relying on letters. Eina left home when Nina was an infant, and Nina later enrolled in the School District during Eina's absence. Interactions were awkward; Nina initially idolized Eina but became depressed failing to match her academic achievements. The sisters reconciled after Bell facilitated communication, helping them understand their mutual admiration. As Bell Cranel's primary advisor, Eina initially viewed him with sisterly concern, rigorously guiding his dungeon explorations. Her feelings evolved into romantic affection after witnessing his emotional vulnerability and determination, documented in a personal logbook detailing his growth and her reflections. This bond was tested during the Xenos arc when Eina felt excluded from Bell's secrets but later risked her position to support him. Her attachment proved resilient against Freya's citywide charm magic erasing memories of Bell; though affected, Eina subconsciously retained emotional echoes. Reading her journal during this period triggered unexplained tears, and after the charm broke, she confronted Bell with relief and frustration. Eina continues supporting Bell's development despite his rising rank reducing her advisory role. She facilitated his School District visit, indirectly aiding her reconciliation with Nina. She demonstrated moral courage by challenging Guild leadership decisions she deemed irresponsible regarding dungeon management. Eina's non-combat abilities center on intellect and administration. She possesses encyclopedic knowledge of dungeon ecosystems, monster behaviors, and tactical planning. Her hieroglyph proficiency allows interpretation of divine scripts, including adventurers' Falna status updates—a rare skill even among Guild scholars.