Abe no Yasuaki serves as Genbu of Earth among the Eight Guardians. He is an artificial human magically created by the onmyōji Abe no Seimei without natural birth. Though he appears around twenty-one years old, he has existed for only two years at the start of the main story, resulting in a childlike naivety toward human emotions and social intricacies. He possesses an analytical and cold personality, initially lacking human emotions and perceiving himself as an incomplete tool rather than a person. He has heterochromia and typically wears his hair in a ponytail with traditional onmyōji attire. As an onmyōji, he wields spiritual abilities inherited from Seimei, manipulating yin-yang energy, casting spells through yang-enhanced gems on his necklace, and commanding bird-shaped shikigami. He converses with spirits and nature, using paper charms for scouting and combat and spell dolls for tasks like cleaning. His unique artificial nature grants him unusual traits: three-month cycles of uninterrupted wakefulness followed by three-month hibernation periods where he absorbs environmental energy, during which he ages rapidly. He requires no food or sleep while active and initially feels no physical pain. His frequent catchphrases, “mondai nai” (no problem) and “wakaranai” (I don’t understand), reflect his emotional struggles. His character development centers on his bond with the Priestess of the Dragon God, Akane Motomiya. Through her influence, he gradually discovers human emotions, initially confused when unable to “read” her heart like a tool. He learns to feel guilt, loneliness, and chest pain upon separation from her, ultimately allowing him to stay by her side and openly express his feelings. In later storylines, he reappears as Yasutsugu Abe, a non-human guardian formed from his predecessor’s residual energy, sharing similar traits and eventually awakening as fully human.