Marbas

Marbas (マルバス) is first seen as a humanoid appearing seraph.. A character in the Seraph of the End series, that he exists at all was first learned by accessing memories from the prehistorical past. Observed within a seraph civilization, Marbas was involved with a project to return seraphs to paradise that Sika Madu was planning.

Appearance
He appeared as an adult male, an attribute that he shared with Raum. His short light-colored hair appeared darker underneath as the back. Marbas' distinct eyebrows were different to his hair color. His pointed seraph ears were visible, as were his prominent pair of feathered wings. Although not seen, it is likely Marbas would also have pointed fangs as other seraphs do. For clothing it it probable that it was similar to what other seraphs possessed, specifically a hooded cloak in which the hood section was worn around his shoulders.

He is the only one whose appearance doesn't resemble anyone, but given that the other Demons already have their own version, Marbas most likely refers to Byakkomaru, who hides his face.

Personality
Appearing satisfied, Marbas seemed in favor of Sika Madu's project to return seraphs to paradise. That he was thanked for his help may indicate that he worked hard on projects such as the Tower of Babel.

History
Seen to have been located on prehistorical Earth, which was referred to as the Sol System First Satellite Kingdom, he was within a seraph civilization during that time. Around the civilization existed dinosaurs long before humans had even evolved. Marbas would have lived among cloaked members of his kind along with Homunculi in this civilization. Present at a gathering of seraphs, Marbas heard Sika Madu's announcement that the tallest tower among the satellite kingdoms had been completed. After the effects of photons were demonstrated to the seraphs by Sika Madu, there was a plan to return to paradise on the Sun where God was said to await.

On Sika Madu's raised platform, after Bael and Paimon had addressed his majesty the King of Earth, Marbas along with others was thanked for working so hard and for so long. Fire was emitted from a cloaked seraph's head area before Marbas was revealed. The same occurred for Amon, with Belial, then Astaroth, and Bathin. Around Marbas there was also Naberius, along with Raum, and Orobas too.

By the time Paimon and Bael had passed away, Marbas was not seen with the remaining angels who headed to Sika Madu at their graves to update him that the tower was completed. While Belial's grave was seen, there was no indication on where Marbas was, something shared with Orobas.

Story
Marbas' presence on a prehistorical Earth was revealed to Yu and Mika after they used their demon-based powers to access memories. In discussing how the angels in the memory looked familiar, it was observed how Bael resembled Urd, and Paimon looked like Saitō. For Marbas however he would have been the only true new existence to Yu and Mika since they have either seen or heard of other vampires and demons who resemble these seraphs.

Sika Madu
Praised by the King of Earth, Sika Madu, and permitted to be physically near him where other seraphs were gathered below, Marbas appeared closely involved with his project to return seraphs return to paradise. For this it is likely Marbas assisted with the Tower of Babel project.

Trivia

 * Aside from Sika Madu who remains largely as he is, the ten other human appearing seraphs all resemble different vampires and demons of later eras, all except for Marbas. There is no being in human memory who looks like Marbas. From the eight revealed seraphs, they look like vampires would all be third progenitors. That Marbas exists may indicate there is another third progenitor vampire to be shown to the series.
 * Marbas as a name is a specific character in demonology-based works of literature who can also be known as Barbas and is often depicted as a Great President of Hell. In bearing a demon name, it is a characteristic that Marbas shares with other seraphs.
 * With fire being depicted appearing out of some cloaked seraphs' head areas, where floating embers were also shown around Marbas, it is possible this displayed a transformation where one of the indistinguishable cloaked seraphs became the human appearing Marbas.