The most powerful leader of ACROSS, That Man is Pedro's and Nabeshin's archnemesis, who masquerades as a friend and seduces both Pedro's sexy wife and the Great Will.[3] That Man is part of the ACROSS Six, the governing body of ACROSS, and longs to use "the power of the Great Will and the devilishness of the woman" to take over the universe. Appears only in the anime adaptation.
An old friend of Aramaki, who appears in episode one.
An old man who lives in Milos, a slum located at the bottom of the trench separating Amestris and Creta.
Vaccine Man is a creature born due to the massive pollution released across the Earth by human beings. According to him, he was created as an incarnation of nature's wrath, meant to wipe out humanity and thus effectively vaccinate the earth against future infections. He is the first enemy faced by Saitama shown in OnePunch-Man.
A servant of Rage Row and his family.