Professor Sōichi Tomoe, a disgraced geneticist and astrophysicist exiled from academia for unethical experiments in genetic manipulation, cybernetic integration, and hybrid life-form engineering, leveraged his illicit research to finance Tokyo’s Mugen District acquisition. There, he founded Mugen Academy as a facade for his operations. His descent followed a laboratory fire that claimed his wife, Keiko, and left his daughter, Hotaru, near death. Desperate to sustain her, he embedded cybernetic augmentations and a Daimon Egg tethering her to the cosmic entity Pharaoh 90—a decision that corrupted both him and his assistant, Kaori Kuromine. This pact led him to merge with Germatoid, a Daimon entity, in exchange for forbidden knowledge and power, cementing his allegiance to the Death Busters. His ambitions then focused on synthesizing “super life forms” by merging human and alien biology, spawning the Witches 5 and legions of Daimons. His relationship with Hotaru fluctuated between paternal affection and calculated exploitation. Early indulgence gave way to emotional detachment as his obsessions deepened. Even after his physical transformation into Germatoid eroded his humanity, fragments of his consciousness surfaced during a fleeting interaction with Hotaru before Sailor Moon’s Rainbow Moon Heartache attack obliterated his mutated form. Hotaru later reflected that her father’s essence had vanished long before his corporeal end. Alternate narratives diverge: the original anime frames him as Germatoid’s unwilling host, surviving the entity’s destruction with amnesia. He briefly tends to Hotaru’s reincarnated form before her guardianship shifts to Setsuna Meioh, after which he disappears. Stage adaptations introduce scenarios where entities like Dreadful Berserk usurp his body, though vestiges of his paternal instincts persist amid antagonism. His legacy intertwines scientific hubris, ethical collapse, and the peril of unbridled ambition. By merging human and extraterrestrial life and subordinating morality to progress, he ignited cascading personal and planetary catastrophes, embodying a cautionary archetype of knowledge divorced from conscience.