ONA
Description
Kasukabe is an elderly doctor and researcher residing in the Hole, the grim, dystopian city where much of the story takes place. Despite being sixty-four years old, he possesses the youthful and slight physical appearance of a teenage boy, standing at just 155 centimeters tall. This unusual condition is the result of a sorcerer's magic that transformed his body, reverting his physical state to that of an adolescent while leaving his mind and age unchanged. His original name is Haze, but he adopted the surname Kasukabe from his estranged wife, Haru, and continues to use it for his medical practice and research.

In terms of personality, Kasukabe is driven, methodical, and possesses a strong, if unconventional, moral compass. His primary motivation stems from a deeply personal place: he began his extensive research into the anatomy and constitution of sorcerers in an attempt to find a way to cure his wife Haru when she fell ill. After she left him, his scientific pursuit evolved into a dedicated, lifelong obsession. He runs a clinic in the Hole where he treats victims injured by sorcerer magic, but his true passion lies in the study of sorcerer corpses, dissecting and experimenting on them to unlock their secrets. This passion is not rooted in cruelty but in a genuine, almost academic curiosity and a desire to understand the nature of magic and its users.

Kasukabe plays a crucial role in the story as a key source of information and practical aid. He is one of the few humans in the Hole who possesses a deep, empirical understanding of sorcerers, their biology, and their world. His knowledge and research materials become invaluable to the protagonist, Caiman, and his partner, Nikaido, in their quest. Notably, he uses his research to construct a working portal made from sorcerer skin, providing Caiman with a rare and dangerous means to travel into the sorcerers dimension. His expertise also extends to performing complex surgeries, and he is the one who confirms through his examinations that Caiman is biologically human despite his reptilian head.

Several key relationships define his place in the narrative. His connection to his missing wife, Haru, is a profound emotional anchor, and much of his personal journey involves the hope of reuniting with her. He also forms a significant alliance with the En family cleaners, Shin and Noi. Despite their violent profession, they develop a mutual respect with Kasukabe, becoming close friends and allies who often assist him in his hunts and investigations. His relationship with Shin is particularly notable, as Shin warns him to stop helping Caiman to avoid drawing En's unwanted attention, demonstrating a concern for Kasukabe's safety. Another critical relationship, explored through his past, is with a young Hole inhabitant named Ai Coleman. Ai, who longed to escape the Hole and become a sorcerer, became Kasukabe’s assistant and the subject of a desperate, experimental surgery after being fatally poisoned. This event haunts Kasukabe, as Ai later died under mysterious circumstances, but the absence of a death record leads Kasukabe to suspect that Ai may have resurrected and become the mysterious leader of the Cross-Eyes, a powerful and violent sorcerer faction.

Kasukabe demonstrates notable development throughout the story, transitioning from a reclusive researcher solely focused on his work to a more active participant in the dangerous events unfolding around him. His personal quest to find his wife becomes intertwined with the larger conflict between the Hole and the sorcerers, forcing him out of his clinic and into the field. His abilities, while not primarily magical, are formidable. He is a skilled and learned surgeon and biologist, proficient in vivisection and the arcane science of sorcerer anatomy. Rather than rely on magic in combat, he prefers to fight like a normal human, wielding a simple claw hammer with surprising effectiveness. He chooses this method because he considers using magic against those who cannot use it to be unfair and akin to bullying. This preference, combined with his extensive knowledge, sharp intellect, and determined nature, makes him a resourceful and resilient figure in the harsh world of Dorohedoro.