Mephistopheles Yōma

Only found in Lost Canvas, Heavenly Chief Star, Mephistopheles Yōma (天魁星メフィストフェレスの杳馬) is a Specter. He appears before Gemini Aspros, to thwart his attempt on Hades' life.

Referred to as "the father of my rival" by Hades, and bearing a physical resemblance to Tenma, it has been revealed that Yōma is the father of the Pegasus Saint, who is known as the only man who has hurt Hades' body since the ages of myth. In the same vein as the Shakespearian proverbial phrase,Yōma compares life to a stage play. It was also revealed, that it was Yōma who planted the seeds of evil in Aspros' heart during his time as Saint apprentice, spawning the conflict between the twins and Aspros' evil aspirations in the past.

Years later, Yōma engages Aspros in battle, ensnaring him within his technique Marvelous Room (マーベラスルーム), a vortex in time and space, capable of dissolving the enemy into quantum particles. Afterwards, Yōma leaves to challenge his son, whom he spots as the latter reaches the place Yōma is probably in charge to protect, the first Demon Temple (Mercury), along with Shion and Regulus.

Yōma projects a vision in Tenma's mind, showing him the distant past, during his days as a newborn, surrounded by his mother Partita, his father and a young Pandora. Much to his surprise, Tenma refuses to acknowledge Yōma as his father, mentioning he died years ago. Yōma continues reminiscing about the past, revealing his Japanese origins and his embracing of his destiny as one of the 108 Demonic Stars. Yōma also reveals that Hades' soul was born from Pandora's mother during a snowy night, and that he ran away that night to escape the twin gods and find Hades' chosen vessel, by disguising himself as a priest. Furthermore, Yōma relishes in toying with Athena and Tenma's psyche, to force them to question their roles in their current incarnation. Afterward, he leaves Tenma alone as he rejoins Hades. He later resurfaces during Athena and Pandora's encounter revealing Partita alive, and revels in the latter's apparent murder of Pandora. He then engulfs Tenma in a whirlwind, transporting him to the next Demon Temple, to engage Partita as a Specter, in battle. He resurfaced witnessing the encounter of Leo Regulus and the Wyvern Specter.