Yuu= He/Him cuz its people pov
The coffin did not contain a single person but instead two people, stuffed in together uncomfortably: a boy and a girl whose appearances mirrored each other as expected of twins.
Crowley did not know this when he first declared Grim and one of the twins to be two in one package students because one wandered off when this happened. Once united, the twins realized that if they admitted there was a third person, it would either be the other twin or Grim, who might not be able to go to NRC.
They had made the decision to fool everyone that there were only two beings instead of three living in the ramshackle dorm, just so that no one could separate them.
The twins became one person, exchanging places every day and making sure they detailed their day down to the specifics in case someone asked them.
Since they had different genders and personalities, naturally, their behavior didn't match up, so they tried to create another persona mixing some of their characteristics instead of creating a new one, which would be hard to play the role.
The way they moved was easy to mimic because they were twins who had done everything together, but sometimes it was easy to forget who they were supposed to be, leading to the image falling apart. So, the persona must have a certain gait made from a mix of them.
The same goes for the rest of their characteristics. They took the differences between them and mixed them into one. The soft-spoken girl and the hot-tempered boy became a person who was well-mannered but wouldn't be afraid to retaliate. The brain and the brawn combined to be a competent person.
This person was Yuu, a persona which the twins must become so that their secrets are safe.
It was hard to maintain this persona, but the twins got to rest some days when it wasn't their turn, and the paperwork dropped by Crowley was done much faster with two people. In addition, one could even go to school while the other did some errands outside of school. This meant easy money stockpile, although it dwindled slightly since there were three living beings now.
They were certain that their secret was safe, even though some had cast suspicious looks at them, but no one had ever spoken out loud about it, so that was fine.
However, being seen as something not entirely human did not crossed their minds.
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Everyone thought Yuu was strange. Almost all who paid more attention would notice that there was something wrong with him.
Yuu's voice couldn't stay the same tone. It changed frequently and subtly. It would be low and high-pitched, like a normal male voice trying to sound a bit like a woman, and another would resemble a young boy trying to imitate a man's voice by deepening it.
They thought Yuu was messing with them or it was just his way of talking. Not that they fully believed it, but it was better to ignore things, you know?
Often, Yuu spoke politely, and then the next moment, he would send a glare or speak with a hardened tone to someone who managed to offend him in some way. People didn't really get scared at that, seeing as it was just a mild scolding.
Another day, he would do the same, but it was different. This one seemed forced when speaking softly, yet when he was mad, that's when it was the most genuine, and it scared most people.
Someone once caught Yuu looking at a mirror and practicing his expression.
The said person thought it was funny until Yuu said, "My facial muscles are too stiff. I can't get it right."
They all thought Yuu was similar to Floyd, but clearly, this was a different case.
And not to mention, Yuu's movements seemed calculated, as though he was scared of making a mistake. Sometimes they were too stiff, and other times there were too many sways or the steps were irregular, and so on. Some noticed that Yuu's eyes widened slightly before assuming a certain gait that the others had seen plenty of times.
"I almost forgot how to do this…" his murmurs could still be heard, and it made everyone break into cold sweats rapidly.
Some beastmen thought they smelled the scent of a female on Yuu, but the next day it was male. It was different every day, and sometimes it happened in a row. He confronted Yuu one day and was met with a blank face, and then a rather tight smile.
He did not get an answer, but the next few days, the scent of a male on Yuu continued, and Yuu's gaze bore into his soul with a vicious glare.
His mind had come to a conclusion that Yuu was not human.
Some say they witnessed Yuu's doppelganger in some random place before stumbling upon another Yuu, which frightened most people because Yuu denied having seen them, and he had an alibi with Grim.
Yuu's friends, the first-years, thought that Yuu and the ramshackle dorm were weird and creepy. Often, they would hear Yuu talking to himself or loud noises coming from a different room or sudden shuffling when they looked back.
Yuu had them all convinced to announce their presence before opening a room because of ghosts or something. Yuu would also cook plenty and then eat and leave one serving behind, telling them not to touch it.
Yuu would then leave the room and return after a couple of seconds to eat that one serving, much to everyone's confusion and surprise. After all, Yuu usually ate little, and sometimes the plate was full, but this time, there were two plates.
When asked, Yuu who devoured the food almost like a starving animal simply replied, "I'm hungry."
Seeing his everyday strange quirks, the meaning simply changed into something else.