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Hiroshi Tōdō is Robin's "father", the brilliant scientist who designed her genes and artificially inseminated her within Maria. He researched a new project to repair the conflicts between humans and witches, however all evidence of his research was destroyed by Solomon because of the potential danger it contained, although it was far too late as the project had already reached its final stages. He entrusted Juliano with Robin's care, after Maria's death, gambling that Juliano would let her live. In the last episode, a recording of him is displayed on a computer in The Factory, explaining everything about his project, Robin's origins and potential, and the origins of Solomon's fear of witches (much to Zaizan's dismay). He is voiced by Naoya Uchidain (Japanese) and Tony Oliver (English).