Prompt: Izuku decides to pull a prank on Aizawa and sets up a fake cult as a joke. It ends up backfiring on him and accidentally ends up as a cult leader. Hilarity ensues.
I don't know about hilarity as I write these within 30 minutes, but I'll give it my best.
BTW, this comes from Discord.

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I'm bored, so you know what that means! It's time to fuck with Shouta's mentality!

I am mentally tired of being trapped at UA, so I decided to sneak out and head to the park for this idea.

Here's the tea: People do practically anything for money. I have money from when I was originally being paid to do cases, so I can pull this off.

I jump on top of a bench to start my speech,

"Hello, everybody! I am-!"

"OH MY GOSH, ARE YOU MIDORIYA IZUKU?!" I look down to see an excitable boy at my feet. It seems I have a fan already! That makes my life one person easier!

"Yip yip! Are you a fan?"

"Uh-huh! I am in your cult and everything!" Wait a diddly darn second. My prank on Shouta was to going to be to start a cult. If there's already a cult of me out there, I might be able to convince them to help me with this!

Though, I have no idea how I feel about already having a cult following me.

I hop down, "There's already a cult of me?"

"Yeah! We meet every day in a few minutes! That's where I was heading right now!"

"Well, mind if I join you?" I think I broke the kid because he explodes in happiness.

"YES YES YES! COME ON, THIS WAY!" The boy starts running, and I follow quickly after. He leads me into this cute little cafe, and when he enters, he is still screaming, "GUYS! I BROUGHT MIDORIYA!"

You know, I was expecting maybe five to ten people. I wasn't expecting 100 people to be looking at me when I enter the door and start panicking!

I clear my throat, "Everybody calm down! Jeez, I'm not that amazing!" One of the ladies, who looks to be in her 20s, pushes through the crowd to approach me

"What are you talking about?! You are doing so much, yet you are accepting nothing for it! You are fighting for quirkless rights, and you don't let people push you over! I am Sonia, by the way, leader of this cult!" She bows to me, and i can't help but feel awkward.

"Upright, no need for that. That makes me curious, though; how many of you are quirkless?'" About ten or so people raise their hands, though they are definitely older than me, " I think this is the most quirkless people I have seen in a room together ever. Thank you very much for your support! Like, it feels amazing because I never really interacted with people like this before as life is a bitch! Damn, I'm mentally recovering, give me a moment. Well, what do you guys do in here?"

"Oh, we do quirkless rights marches, discuss you, and support you in any way we can!"

"Any way? Does that mean I can get everyone here to help me with a prank?"

That catches everyone's attention.

"YEAH!"

"UH-HUH!"

"YIP YIP!"

I chuckle, "Alright alright! I need everyone here to come in front of UA and act like a cult for me, and that I am your cult leader. In exchange, I'll come to these meetings and join ya'll."

Sonia looks at me with surprise, "Really?!"

"Yeah, why not? Ya'll in?"

With a loud scream of encouragement, we head out to go to UA.

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In Front Of UA

"LEFT LEFT LEFT RIGHT LEFT LEFT LEFT!" I yell at the top of my lungs as a line of people marches in sync behind me. We line up in front of UA, and I have everyone set up in military-style. I stand in front of the gate, "EVERYONE BOW TO YOUR LEADER!"

Instantly, everyone gets on their hands and knees and bows to me. YAS! I can hear laughing, but that's expected because this is ridiculous.

Legit, no one should follow me.

I command, "Everyone straighten up and start singing 'Never Gonna Give You Up!'"

The cult actually does it,

"We're no strangers to love!

You know the rules, and so do I!

A full commitment what I'm thinking of!

You couldn't get this from any of guy!

IIIIIIIIIIIIIIIIIII just wanna tell you how I'm feeling!

Gotta make you understand!

NEVER GONNA GIVE YOU UP!

NEVER GONNA LET YOU DOWN!

NEVER GONNA RUN AROUND AND DESERT YOU!

NEVER GONNA MAKE YOU CRY!

NEVER GONNA SAY GOODBYE!

NEVER GONNA RUN AROUND AND HURT YOU!"

As they are singing, I hear laughter behind me as Hizashi and Nemuri decided to join to watch this beautiful scene happen.

Then, Shouta comes. When he sees what I did, he pinches the bridge of his nose, "Izuku...why? Actually, how did you even manage this?"

I grin, "They wanted to follow me, so I let them!"

He sighs, "Tell them to go away or I will call the police."

"So mean! ALRIGHT EVERYONE, YOU CAN GO BACK! SEE YOU NEXT TUESDAY! THANK YOU FOR COMING!" I scream to the crowd. They yell a 'you're welcome' back and start going back.

Meanwhile, Shouta is mentally recovering, "That's the most disturbing thing I have seen. Nobody, let alone that many people, should ever follow you."

"I don't know what the fuck you're talking about because that was the most beautiful thing I have ever seen."

"Because they will listen to you."

"Exactly!"

"...I need to set you up an appointment with Hound Dog."

"Whatever, it was worth it!"

And it seriously was!