Before the match started, I made sure to ask Midoriya about her quirk. Not only that, but he provided me with background knowledge on her, and weaknesses to exploit that I might not know about. Apparently, she's super dumb. 

There's one illusion I can try to pull off. I haven't had much time to practice it, so her being dumb was pure luck. She'll be my test run for this, and if I don't make it to the next round then that's okay. Her quirk type is an emitter—acid at that—so if she attacks I'm don't for. So I'll try using something confusing. Confusing to the point where she wouldn't think to attack.

"Once again l/n, good luck!"

"You too Ashido!" I say with a smile. 

"Start!"

(Basically one big spoiler for Madoka Magica episode 3. Skip if you don't want to be spoiled)

I start singing:

https://youtu.be/e6CS1nKFXCo

"Käse, Käse, wo ist die Käse?

Käse, Käse, will ich hin!"

After those two lines, multiples of me begin appearing around Ashido in a circle—instantly appearing two at a time on each side. A new pair appears after every beat.

"Käse, Käse, bitte einmal Käse                                                                                                                               Käse, Käse, Zug nach Käse"

After that, multiples of me completely surround her. Then we start running around her to confuse her on who is real and who isn't.

"Bitte nach Käse                                                                                                                                                       Schnell nach Käse                                                                                                                                                           Zug nach Käse"

We continue to sing.

"Käse, Käse"

We stop. We disappear one by one.

Ich will Käse
Zug nach Käse
Käse, Käse,
Zug nach Käse"

There's one left.

A creature emerges from her mouth:

https://youtu.be/f4gHkGy_ZGc

(0:45)

"Käse, Käse, wo ist die Käse ?
Käse, Käse, wo ist die Käse ?
Käse, Käse"

Ashido runs away from this thing before it can "bite her head off."

She doesn't pay attention to the boundaries and ends up running outside of them.

"Ashido is out of bounds! L/n moves on to the next round!"

The crowd cheers for me as Ashido pouts over her loss.

"No fair, you scared me out of bounds!"

"Hehe, sorry. It was the best thing I could've done really."

We begin walking back.

"So what would've happened had I not run?"

"Oh nothing, my quirk is illusions, it couldn't touch you in the first place."

"Ohhh. That makes more sense. Well good luck against others with emitters, they aren't as much of a fraidy cat as I am."

"That's not true. Okay, don't tell anyone I told you this, but I used a similar illusion against Todoroki—the same creature—and he screamed."

"Holy-Hahahahaha holy shit l/n. Seriously? That's hilarious. Good to know it wasn't just scary for me too."

"Hehe. I'll see you later, there's someone I'm gonna go look for."

"Ok, good luck. Wait,"

"Hm?"

"Is it that guy, Shinsou I think it was. You were yelling to him after his match and were on the same team in the cavalry battle. Plus Hakagure was teasing you about him during the "cheer battle."

So Hakagure is her name.

"Um, uh." I blush and smile in an embarrassed manner.

"Huh?! So you do like him!"

"I never said that!" I scream.

"Yeah, Yeah." She waves me off in a sarcastic way.

"Also, don't spill the beans on my quirk. I'm using that to my advantage."

"You got it, l/n."

I go look for Shinsou in the general studies area, when someone taps me on the shoulder. I jump at their touch and turn around.

"Hi, uh, I saw you earlier. Are you looking for someone? You seem lost." It was a girl with a light, tan coloured hair

"Uh, yeah actually. I'm looking for Shinsou, hehe."

"Oh, him? He's sitting just over there." She points towards a section not too far from the we're currently at.

"Thank you." I wave.

"No problem, and nice job, though it was kinda weird."

"Hehe, that was my goal. I wanted to confuse her so that she didn't attack."

"That seems pretty solid, well good luck for your next match."

"Thank you." I feel bad for only really saying "thank you" but I couldn't think of much else to say.

I walk over to where Shinsou was sitting and blush—remembering what I said a little bit ago.

"Hey, uh, mind if I sit here for a bit?"

He looks up. "Oh, l/n. Uh, sure."

I sit down next to him and he starts talking to me.

"Nice job, it was fun to watch—knowing your quirk and everything.  And what the hell did that song mean."

"Uhh, thanks. And the song is actually kind of stupid when translated, but when put in the context of its story, it's actually kind of sad and scary in a way. Ok, 

Cheese, cheese, where is the cheese?

Cheese, cheese, I want to go there
Cheese, cheese, one cheese please
Cheese, cheese, train to cheese

To cheese, please
Fast to cheese
Train to cheese

Cheese, cheese
I want cheese
Train to cheese

Cheese, cheese
Train to cheese
Cheese, cheese, where is the cheese?
Cheese, cheese, where is the cheese?
Cheese, cheese.

That's basically what it is translated. 

(Spoilers for Madoka Magica. It isn't essential to the story so you can skip if you're planning on watching.)

But the story is that there was a girl named Momoe Nagisa, and she was offered any wish in the universe and in turn she had to fight these creatures. She loved cheese very much—as you could probably tell—and her wish was based on that. Her mother was also very sick and her father was  absent, so she combined these two things. Her wish was for a single cheesecake that her mother found the best. It sounds weird, but for a wish the phrasing is very important. 

Not long later, her mother died in a hospital. She got her wish but was alone without parents. It isn't definite, but her age was anywhere from eight to twelve. There was something about that deal she took that she had not known. If they—well to explain that part better—what she became after making her wish was essentially a being of hope. But when they fell too deep into despair, they became the very creatures they were destined to fight. The creature that appeared, was Momoe's creature—her witch.

And Ashido's position was the very position of the girl her witch killed. Instead then, her head was completely bit off, and then her body was devoured. And do you know why? Well this girl who Momoe's witch ate, was blonde. And Momoe's witch mistook her for cheese."

"Well uh, interesting story to say the least."

"Haha."

"I guess that is pretty sad. So I'm guessing the story is true then? Because you used it as an illusion and knew fully what it looked like."

"Yeah, it is. But it's really old. I was searching for inspiration for different illusions when I stumbled upon the story of magical girls."

"So that's what they're called."

"Yeah, and there's even a possibility that the ones who offered those contracts are still here. The legend did say that they are only visible to those they want to see them. And that they communicate through telepathy."

"Hm. That's pretty interesting. Is there a specific demographic of people they choose to offer these contracts to?"

"Yeah, this'll sound kinda creepy, but young girls. But the thing is like a white cat-ferret thing with a red tear drop in its back and yellow rings around its ears? I'm not sure what they are, but I'll show you a drawing later."

"That sound cool. If you were offered that deal, would you take it?"

"No."

"Huh? Why not?"

"The way it's described to exist as a witch, is pain beyond one could imagine. Emotional, mental, and physical pain completely drowns you. You're surrounded by every mistake and regret and what you could've had is always within sight but just out of reach. Pure and utter hell. And there isn't any guarantee anyone would find and kill me to end my misery. Plus, a witch lures victims into their labyrinths to torment and kill them—not very heroic."

"I get it now—why you call it a labyrinth. I guess your quirk is very similar."

"Yeah, it's basically the same but I can control what the inside looks like, they can't. My quirk is actually how I found out about this story. I have no idea how my quirk is related to this, and how I got this power. But it's something I've wondered for a long time. Maybe a magical had a kid with someone with a quirk and it mutated to this? I'm not sure."

"But that sounds very painful—to be a witch."

"Yeah, I'll show you the exact descriptions later, since I don't have it with me."

"Hm."

We were so busy talking, we failed to notice that all of the first round matches were over."

"Damn. Was hoping to watch Bakugou versus Uraraka."

"Did you record it at home?"

"No, I live alone and since I knew I'd be here to watch in real time,  I didn't think to record it."

"Oh. Well it'll probably be online later."

"Yeah, probably."

"Hm."