Toenail of Satan is the main villain, the wicked principal of the Academy, who dresses in a fearsome white demon mask and jester hood. In the anime he claims to be a Demon.He is extremely perverted and obtains satisfaction from sexually humiliating the female student body, especially Mayumi Takahashi. This often brings him into conflict with the voluptuous Kekko Kamen, whose secret identity he wishes to uncover. To accomplish this, he brings out various punishment councilors to publicly humiliate Takahashi, using her as bait to bring the curvy naked warrior of justice out in the open. However, he always manages to be defeated by her. He also appears in Maboroshi Panty, as well. In volume 3 of the "Maboroshi Panty" manga, when the crime rate at Susumi's school continues to escalate, the administrators bring in Kekko Kamen's fiendish enemy, the villainous Toenail of Satan, to take over as the new Principal of the school. With him, the masked demon brings his usual team of sadistic teachers and humiliating punishments. Maboroshi Panty then seeks to put an end to the villain's method of education.
He was voiced by Jouji Yanami who was also Dr Umon and Emperor Vega in UFO Robo Grendizer and UFO Robot Grendizer vs. Great Mazinger, General Angoras and Professor Gennosuke Yumi in Mazinger Z Vs. Devilman, Mazinger Z Vs. Dr. Hell, Mazinkaiser vs The Great General of Darkness, Mazinger Z vs. The Great General of Darkness, Mazinger Z, Mazinkaiser, and Great Mazinger, Grendizer, Getter Robo G, Great Mazinger: Monster of The Ocean Floor, Benkei in Great Mazinger vs. Getter Robo G: Clash in The Sky, Yamamori in Dororon Enma-kun, Pochi in Devilman TV and Takeshi Kisaragi in Cutey Honey.
In the most excellent ADV dub hes voiced by Rob Mungle who was Henry Douglas in FMA Brotherhood, Shibakusa in Godannar(hot), Hatanaka in Gantz, Regan in Golgo 13, Uighur in Legends of the Dark King: A Fist of the North Star Story(loved that Mongolian bada55), Goat Hory in Martian Successor Nadesico, Bear Geki, Cancer DeathMask in Saint Seiya, Guile in Street Fighter II V Adv dub, Narrator in Sorcerer Hunters (hot) and Momiji Teruyama in Needless.
- Hanappe Bazooka: Around 3/5ths through Hanappe Bazooka OVA he is seen in a room full of cameos(Devilman, Sirene, Baron Ashura, Count Brocken ect) at a Demon ritual in Hanappe's home after Ophisto Bazooka and Mephist Dance become part of Hanappe's life.
- Violence Jack: in Volume 17 of V Jack is the chicks working for Honey Asuka acting out a Kekko kamen stage show. The black chick plays him.
- Mazinger Angels; He's in a chapter. There's a lot of curvy babes.