Child Resembling Yu

This unnamed youth is the earliest known human appearing in the history of the world of the Seraph of the End series. He was formed fully by a homunculus along with Sika Madu's power. Where he physically resembles Yu of the present day, his existence would be learned about by him and Mika when they access memories from the time of Earth's prehistory. This youth took an interest in Mikaela and alone was able to received communications from him even though he was deceased at the time.

Appearance
He appeared as a male child with short dark colored hair. his facial features from his eyes to eyebrows are virtually identical to Yu.

Personality
Curiosity was shown in asking who someone was, where he also had questions of where he was. Upon spotting another child, he enthusiastically ran over to enquire who they were. Amazed at matters, the youth was impressed with how big the landscape was. Among other children he was merry and appeared to be frolicking across the grass at one point.

It is unclear what effect a fallen angel soul entering his body had on his personality. Slightly more lively, his curiosity may have led to him being the only child to notice the coffin of Mikaela within view. For what roused his interest, many cross-shaped grave markers that were within view might have been something new, yet rather than be interested in them, or trees around as other potential areas of interest, the child paid specific attention to the new to him object of a coffin. Again direct in kindly asking who they were, the youth listened at what Mikaela had to communicate. Upon hearing that Mikaela could not play with him, he responded with a limited amount of disappointment that he did not like that. Perhaps not deeply upset though, the child resumed listening politely.

While possessing completely functional mental capacities, the child was aware of what sleeping was, yet he did not understand what someone meant they said they were dead. It also did not seem anything out of the ordinary for him to interact with someone who was physically still, with no surprise that he could be communicated to by someone who was not opening their mouth at all. Appearing happy, the child had the intelligence to appreciate what Mikaela meant with what is a complex idea of a soul entering another's body. Appearing to have a concept of a soul, the child perhaps did not realize that his own sense of self could potentially disappear should another soul enter his body. Nevertheless, and perhaps from him being altruistic, at understanding that Mikaela wanted to save his own dad he was more than happy to help.

Ambitions
After his curiosity was apparently sated in learning who others were, this boy would form a first aspiration after interacting with Mikaela. Where Mikaela sought to enter his body in order to save his dad, the youth was happy to proceed with this. Since it was something Mikaela wanted to do, and because of the kindness of the youth he was keen to assure him they would save his dad together.

"Okay! If you want to. We'll both save him together."

- Inviting Mikaela's soul into him in order to save his dad, Sika Madu.

Pre-arrival on Earth
If this child was outright created as he was, or transferred from a different location that he was living in, either way he had concepts he was familiar with. Fully sentient and able to speak fluidly, the youth also addressed someone as mister where he was aware of such terms, and indeed called Sika Madu that despite his feminine appearance where he look past outward appearances. He had also possibly seen enough to comment that the area he found himself in was big which consisted of plains, trees and small mountains in the distance. Not surprised to see someone else like him, the child greeted another as children do regularly, by saying hi rather than regarding this other child as something entirely new.

His existence would come about after an undefined millennia after various species of dinosaurs and a seraph civilization had been wiped out by a six-winged angel. Upon being violently ejected out of the base of a homunculus named Yu, the youth landed on his back and would be the first human seen on Earth. Having moved to be on his knees, the child processed what was a new environment for him. Evidently noticing Sika Madu nearby, the boy addressed him as mister and asked who he was. Without waiting for an answer he also questioned where he was before turning his attention to excitedly comment how the place he was in was big.

"Hey, mister? Who're you? Where am I? Wow! This place is big!"

- Arriving in a new landscape and speaking with Sika Madu.

Having paid no mind to the homunculus, after a second child is ejected the boy ran over to greet her. Asking who she is, they began speaking to one another. At least thirteen other children were then produced by the homunculus and it appeared that this boy was one happy among the group. As he was merrily skipping by himself, the youth had the soul of a dead angel fly towards him which was not noticed if it could even be seen.

As with other children around, the boy paused in his movements as the angel soul collided into his being. Appearing somewhat stunned as a shimmering light radiated around his body, the youth's eyes appeared faded out where his pupils were not visible. After his eyes appeared normal once more, he paused for a moment. Suddenly joyous once more, this child had separated from the others as he ran while expressing joy.

At some point the child noticed a lone object nearby. Happily asking aloud what is that over there, the boy headed by himself to investigate. Where it is the deceased Mikaela lying under the glass covering of a coffin, the child rested on that. Speaking aloud that he is so pretty, the youth asked Mikaela who he is. From the boy's acknowledgments it was apparent that he was being spoken to by Mikaela.

"Ooh! He's so pretty! Who're you?"

- Commenting on Mikaela who he had found in his coffin before speaking to him.

Checking whether the individual there was Mika as he presumably heard, the child wondered come how he is sleeping. Surprised to hear that he is dead, the boy asked Mikaela what did that mean. Evidently having had it explained as that Mikaela cannot play with him, the youth was not fond of the idea. Reacting as if he had heard a different matter raised, the child resumed his acknowledgments as he continued to listen to what Mikaela had to share.

Patiently hearing him out, the boy claimed he understands what was relayed to him and told Mikaela he knew what he wanted. Speaking what he heard, the boy stated that Mikaela wanted to put his soul inside him then he will be him and be able to save his dad.

"You wanna put your soul into me? Then you'll be me and save your dad?"

- Speaking aloud what Mikaela evidently said.

With no thought what that meant for his own soul, and with no further information needed on whose dad Mikaela's was, the boy was happy to tell Mikaela okay. Extending his hand, the boy said if Mikaela wanted to then they will save his dad together. After saying to come inside him, the youth reaches towards where Mikaela's face was.

Appearing as if has been struck in the head, the boy remained upright. Able to speak, the boy had a surprised expression on his face after Mikaela's apparent contact.

Story
While Sika Madu was not seen speaking to others later on the happening, the circumstances of this boy's creation and experiences interacting with Mikaela was learned about by Yu and Mika who had delved into memories which brought them to the prehistoric past. Memories of a humanoid angel and seraphs destroying a civilization of seraphs had just been seen, where Sika Madu had been cursed as an undead left to burn alone on Earth.

After Sika Madu used darkness to protect him from the light at that time, Yu and Mika in the memory witnessed his power used on a homunculus to form this child among others. After this boy is seemingly struck in the head, in the present time where Yu is physically located within the Sea of Trees around Mt. Fuji he feels as if he remembers that in fact he is Mikaela.

Sika Madu
Brought into existence by Sika Madu, an angel who ruled Earth who was turned undead for attempting resurrection, and the homunculus named Yu he was with, the child addressed the former in his first words. That curiosity apparently fleeting, the youth would not engage with him again as others appeared. Nevertheless, he would be affected by his actions namely Sika Madu directing the souls of dead angels to be put into the humans. As with others, the child was created by Sika Madu to gather darkness as a different method of resurrecting angels. Although he was the first individual spoken to, the child would have no way of knowing that he soon be speaking to his created son Mikaela, and that Sika Madu was the father he needed his body for to save.

The Homunculus Named Yu
A specific homunculus was the one that brought this boy into the world where he was ejected from an opening at its base. It is not clear what the youth would have made of this floating eyeball-like being as he paid no attention to it, even when it dropped multiple other children into the area. Given the nature of the homunculus and their conspicuous relation to black suns it is possible that the child was not able to see the homunculus which may very well have been invisible to him.

Other Children
Where this boy was the first human seen on Earth, he would be followed by other children including a female with light-colored hair. While he was curious as to who the girl was as another new face to the area, the boy did not share details of who he was which may have indicated a name or a life before appearing here on Earth. Among the children he appeared happy, but would break away from the group where he was vastly more interested in Mikaela on a personal level.

Mikaela
He learned about Mikaela after taking an interest in what was a new object, namely the coffin he was in. Where the boy was friendly with and curious about others, Mikaela was the only one he called pretty. Striking up conversation, the youth asked who Mikaela was and remarkably could get an answer from someone who was deceased. Possibly not being told his full name of Mikaela, he heard the name given as Mika.

"You're Mika, huh? How come you're sleeping? You're dead? What's that mean? It means you can't play with me? Aww! I don't like that. Oh? Mm-hmm."

- Able to be communicated from by the deceased Mikaela.

Unsure what Mikaela meant by being dead, the youth was disappointed to hear he could not play with him yet was content to continue engaging in the one-sided non-verbal conversation. Unflinching at the idea that Mikaela wanted to put his soul inside himself to be him, the boy was happy to comply if that is what he wanted. Out of innate kindness or because it was solely because it is what he felt Mikaela wanted, the youth stated they would save his dad together.

"Okay! If you want to. We'll both save him together. Come inside me!"

- Inviting Mikaela's soul into his body so they can save Sika Madu.

Where the youth's body has apparently been accessed by Mikaela it is unclear whose consciousness is active inside.

Quotes
"Mm-hmm. Uh-huh. Oh! Okay! I know what you want!"

- Speaking as if listening to Mikaela and understanding his words.

Trivia

 * He is the first human seen on Earth.