Mikaela

Michaela (ミカエラ) is a character referred in Seraph of the End. The physical body of Michaela himself was kept during the dark ages of Greece. There were candidates believed to have the Michaela trait.

Appearance
The Michaela seen in the past was stated to be deceased but was well preserved and appeared like an adolescent. He had long wavy, light colored hair nearing his shoulders, and pointed vampire-like ears. Most prominently were four large feathered seraph wings on his back. He bears a remarkably similar appearance to Mikaela Hyakuya as a child.

With Yu seeing a glimpse of Michaela's face, he was under the impression that he was a pretty girl but with Michaela having no clothes on, Noya referred to Michaela as 'him'. When Yu mentions that Michaela could be a princess to be rescued, Sika Madu remarks neither he or Michaela have a gender like humans. While he cannot say whether or not Michaela can become a proper "princess" when Yu refers to him as that, Sika Madu still uses 'he' when referring to Michaela in conversation.

Personality
Supposedly, Michaela has been speaking to Yu and he is described as super nice.

History
The physical body of Michaela was around at some point during the Dark Ages of Greece. His corpse is held in a large see through coffin within in a large room, off limits, and is observed by Noya, Ashera and Krul. Noya comments he was "what all of us were meant to become but failed" and they figure what to do about the Michaela. He is also seen by a young Yu and although stated to be deceased, Michaela's mouth had opened slightly during the period that others were observing him. He is later referred to as Sika Madu's son.

Within a room containing clear fluid filled tanks, Michaela is observed in his coffin by Yu as a child. Unresponsive to the happy calls that it is time to wake up, Michaela is referred to as a princess to be rescued by Yu. Where Sika Madu mentions that a kiss could not bring him back to life, it is also commented that more time, with more sacrifices would be required. With Yu having a secret, he tells Sika Madu that although Mikaela is dead, sometimes he will still talk to him. Where he has not spoken to Sika Madu in eons, Michaela is planned to be brought back to life by Yu and Sika Madu.

Shibuya Arc
In the present time Noya is surprised upon seeing Mikaela Hyakuya and excitedly wonders if Sika Madu succeeded in creating a Michaela.

Post-Shibuya Arc
Visualized when Saito is speaking to Lest Karr about the third progenitors, Michaela is seen within his coffin in the centre of a pillared room. Surrounded by Asuramaru, along with Byakkomaru, then Gekkouin, also Kiseki-o, Raimeiki and Noya, above him floats a ring of Black Suns. In this location, Michaela had Sika Madu carrying a seemingly unconscious Yu towards him.

When Mika is a demon with no memories of himself and makes contact with an eye he comes across, a memory of Michaela's coffin within the room filled with clear fluid tanks is viewed. Where he was deceased, Mikaela did not react to Yu coming in and calling for him to get up. Neither could he respond when Noya remarked that Yu was to be the sacrifice to bring him back from the dead. His coffin was covered with Yu's blood after Noya murdered him. In this memory that Demon Mika is accessing, that Shikama Doji has joined, the coffin is absent as electricity surges outwards after Demon Mika agrees to become Yu's demon.

Shikama Dōji/Sika Madu
His father, Sika Madu was the first vampire and kept his body preserved during the dark ages of Greece. Shikama Dōji states that he is trying to save him, as Mikaela is his precious son. Said to not have spoken to him in eons on account that Michaela is deceased, he is stated to be cared for by the First, where he is planned to be restored to life.

Mikaela Hyakuya
At seeing Mika, the demon Noya is under the impression that Sika Madu succeeded in created a Michaela. They are physically similar as children, yet Michaela's ears were pointed where Mika had human appearing ears. Michaela's corpse would have been available to see by Demon Mika were he not focused on other parts of a memory.

Yūichirō Hyakuya
When lying deceased in his coffin, Michaela was found by Yūichirō Hyakuya who joined the forbidden room that Ashera, Krul, and Noya were in. Visited more than once by Yu who was fond of him, apparently Michaela had been speaking to him.

Trivia

 * When Noya, Ashera, and Krul discovered the corpse of the winged being Michaela, Noya called Michaela "what they all were meant to become but failed to", implying the true nature of the Michaela trait.