Heathcliff Blanchett, a wizard of the Eastern Country and scion of the noble Blanchett family, possesses a beautiful appearance and formidable magical abilities yet struggles with profound shyness, timidity, and self-doubt. He habitually downplays his skills and feels burdened by his responsibilities stemming from both his noble status and magical calling. His physical traits include short blond hair, vivid blue eyes, a beauty mark beneath his left eye, and a wizard crest on the lower left side of his back. He favors attire in blues and whites, typically a long blue coat over a white cassock adorned with golden patterns, paired with brown pants and tall belted boots.

In childhood, Heathcliff and his close friend Shino Sherwood were mentored by Jack, who manipulated them into making an unbreakable promise to protect each other unconditionally. Intended to strengthen their bond and magic, this pact instead scarred them emotionally due to Jack's cruelty and deception. While Shino harbors intense hatred for Jack, Heathcliff's feelings are less severe. This shared trauma fuels Heathcliff's deep protectiveness toward Shino, sometimes manifesting as possessiveness driven by concern for Shino's safety. His care manifests in small acts, like wishing for Shino to grow taller during a Tanabata festival event.

Heathcliff's personality intertwines deep-seated insecurity with fierce loyalty and sensitivity. He distrusts humans, influenced partly by the past betrayal of human comrades suffered by his beloved mentor, Faust Lavinia. Others, such as Cain and Faust, note Heathcliff's self-effacing nature, describing him as humble and easily embarrassed by praise. Under overwhelming stress or panic, his inner turmoil triggers a physical transformation into an obsidian panther.

Relationships anchor his existence. He relies heavily on Shino for stability, though early development iterations depicted Shino as aloof and Heathcliff as the more attached figure – a dynamic later adjusted to ensure player engagement by making Shino outwardly more devoted. Heathcliff also shares a significant bond with Faust. He played a crucial role in reviving Faust after Faust’s near-fatal crystallization during the battle against the Great Calamity, an act facilitated by the Sage's power, underscoring Heathcliff's importance in pivotal story moments.