Who am I

Combat training

It was mainly Yaoyorozu talking about why Iida was the MVP. He got a massive ego boost from it. Once they were finished talking, Bakugo walked away from everyone else and sat in a corner. He looked upset.
Walking over to him, I sat down next to him quietly.
"Hey, what's wrong? You're shaking."
"None of your fucking business."
I looked at him. He was shaking with tears streaming from his eyes. At the end of his fight, he was upset. I bet it's something to do with Midoriyas quirk.
"He was quirkless, wasn't he?"
That caught Bakugo's attention. He stared at me with wide eyes for a moment before nodding.
"That's why your upset. You feel betrayed, lied to. The quirkless boy you bullied can suddenly stand up for himself with a flashy new quirk."
"How did you know?"
"He is visibly scared of you. Then the way you talk and act around him. You see him as an obstacle. A pebble. Don't you?"
Just when he was about to reply, I saw the next group leave.
"You better get yourself cleaned up. The next match is about to start."
"Yeah. Whatever Kazu"
"Be careful Bakugo, that pebble is more like a small rock. Small and common, but with so much potential."

The other fights came and went. Bakugo getting more and more shocked with each one. Realisation he is no longer no.1 slapping him in the face.
Some looked like true heroes. Others, such as Todoroki, sent shivers down my spine. He was terrifying with the ice, the smirk and the glowing red eye.
Eventually, it was my turn. As Kirishima, Sero and I went inside, Tokoyami, Asui and Cho waited outside for five minutes. It was really funny. The boys forgot I was there and put tape around the bomb. Kirishima activated his quirk and they faced the door, prepared for a direct attack. I walked over to the window. They were open slightly. Pushing it open, I saw that it was large enough to get through. Just as I was thinking of a plan, the alarm sounded. The hero's were coming.
I waited a few seconds before poking my head out the window. Just as expected, Asui was scaling the building. Where was Tokoyami and Cho? I'll find out later.
I waited quietly for Asui to reach us. When she did, she told Tokoyami where we were. Then I started talking to her. We talked about anything and everything for about a minute. She slowly got closer, eventually she was infront of me. She let her guard down. Reaching forward, I grabbed her hand, quickly wrapping the capture tape around her wrist.
"Sorry, let me at least help you in."
Pulling her inside, the boys finally noticed my existence. They were horrified they didn't think of the window, and thanked me for watching their back.
But now there was a one question that needed to be answered.
"Where are the other two?"
Sero and I shrugged. How were we supposed to know.
"Boys, I have an idea. Asui. You are technically our hostage. Radio the others. Ask for their location."
"I couldn't do that! That would make me a traitor."
"Shame. Boys, I have an idea. It won't work for Cho but it will make Tokoyami an easy target."
They stood confused for a moment, before they made a decision. Sero telling me what it was.
"Whatever it is, do it. We're supposed to be villains, right?"
Good. They didn't ask too many questions. Kneeling next to Asui, I pulled out her ear peice. Speaking with a sickly sweet voice, I began my act.
"Hello heroes"
"Kazu! Where is Tsu?"
"Don't worry. She's ok, for now. I'd like to make a deal with you, hero. We'll give her back to you-"
"-and you will tell us your location"
Looking up at Kirishima, he smiled. At least he was ok with my plan.
"How do we know you haven't captured her?"
Now Kirishima looked worried. He wasn't prepared to lie. But I was.
"Your little hero is still in the game. We're willing to let her play one last round. What about you? Are you game?"
There was silence. No one spoke. Then Tokoyami's voice came through.
"Second floor staircase. Cho is with me. Now let her go."
He was in our trap.
Sero walked over, finally willing to join the fun.
"How about no"
His voice deeper than normal. He sounded like a true villain.
I notice Asui staring at me. Telling Sero to open the door, I activated my quirk. Creating a blanket of shadows around me, disappearing from sight. I circled the room, giggling as I did. It was scaring her. It was obvious. Eventually, I stopped moving. Stopped giggling. Standing quietly behind her, I got down on one knee, lent forward, and whispered one word.
Boo
She screamed. The sound echoed through the halls. Then a panicked yell could be heard. Hurried footsteps getting closer and closer before he appeared in the door way.
He spoke quietly, his voice barely above a whisper, yet in the silence of the room, it was loud and clear.
"What did you do?"
Then Kirishima stepped forward.
"Nothing bro. Kazu just scared her. A harmless prank."
He ran at me, his quirk activating as a dark bird like shadow appeared behind him. Talons ready. A look that could kill.
Something cold and metallic wrapped around my neck, tightening with each movement. Then came the electricity. It coursed through my veins. Setting every nerve in fire. Grabbing the metal with my hands, I spun. The sudden movement sweeping Cho off her feet and causing her to crash into Tokoyami.
"NOW!"
I yelled through gritted teeth. The electricity still flowing into my body as I tried to free my neck.
I watched through blurred vision as the boys wrapped the capture tape around them.
I heard a voice around the room. Then the boys started cheering. We must have one. Tokoyami and Asui got up, walking out the door. Kirishima walked over to me to help with the wire, but stopped when I raised my hand. A yell echoed through the room as the voltage increased with her shout. Then stopped entirely. Once it was safe, I allowed him to help and we left Cho alone.