3rd Person POV:

"So, you all must be wondering why I have assembled all the staff here today.' Nezu spoke quickly.

Most of the UA teachers in the room nodded, while another (*cough cough* Aizawa *cough*) barely stifled a bored yawn.

"Most of you are aware that All Might will be teaching this year. However, I would like to introduce another new teacher who will be teaching a new subject called Analysis."

On cue, the door to the meeting room opened slowly as the staff members peered towards the new emerging figure.

"Please welcome Midoriya Izuku or better known as Caliginous."

The new figure walked past the others, his heavy black boots thudded with every step he took as his metal belt 'clinked' ever so often.  He stopped and stood next to the mouse bear rat thing, taking a moment to analyse the room with his bored grey eyes, dark circles underneath them. A menacing metal mask covered half of his face while 2 sharp black horns protruded from the top of his forehead, paired with matching black wings and black tail swishing behind him. 

"Hello, my name is Midoriya Izuku as mentioned, but just call me Caliginous."
 Midnight opened her mouth to speak before being cut off again.
"No need for introductions, I know you all and would prefer to not talk."

The rest of the staff watched as Izuku took the only remaining seat, which happened to be located right beside Nezu, who was smiling evilly.

"Now that we have introductions out of the way! Let us plan our teaching schedules for this year. Seeing as the entrance exam has already been held, we can choose who goes into what class now."

Soon the room was filled with chatter as the staff who were going to be teaching were talking about the time tables. Anyone who didn't need to be there, like Recovery Girl, just promptly left. Izuku merely observed, listening discreetly, and after an hour Nezu decided to end the discussion.

"Well then, I think we have the year sorted!"
 The small principal said in his normal cheery voice.
"Caliginous will be visiting everyone's classes every once in a while but mostly the hero course students. In case you didn't know, he is very skilled at analysis despite not having a quirk based around it."

"Speaking of his quirk, what is it?"
Vlad King spoke out, interrupting the principal, who glanced in the silent boy's direction. Said boy was leaning face down on the table, apparently fast asleep but at the mention of his name, he immediately stood up.

He sighed dryly before speaking.

"My quirk is called Fiend."
One sleepy teacher perked his head up and looked at the awfully familiar person.
"I am essentially a demon, wings, tail, horns and all. I have the ability to control dark matter and do anything with it, hence my name, but it comes at the cost of losing my emotions gradually with use; thing is I already lost them all so that doesn't matter. Overuse makes me slightly insane so be aware."

With another sigh, he sat back down again. Nezu clapped his hands and successfully brought the attention back to himself.

"I am glad we are all lively and talking but this concludes the end of this meeting. I will see you all on Monday!"

Nezu left the room and the rest of the staff soon followed.