I-Island tanking
"Of course I'll show you my quirk Melissa." Izuku says with enthusiasm as they step out of David Shield's lab.
"I'm excited. History of Engineering is my favorite elective." Melissa says, bouncing with excitement.
Izuku wastes no time raising his hands into the air as he steps out the front door. Only to walk face first into a wall of metal.
"I know tanks are big but this is ridiculous." Melissa says with shock, trying to find where the machine ended.
"It's not usually this big." Izuku says, quickly opening his notes on tanks and trying to find what he had summoned.
"I would make a joke about that young Midoriya, but this is a real problem." All Might says as he races out of the building with Mr. Shield.
"Ah! I found it. This is a P1000 Ratte, a German super-heavy tank proposal. It has two battleship calibre guns and assorted smaller weapons." Izuku reads.
"Well, how much does it weigh?" Mr. Shield asks.
"Around 1000 tons." Izuku answers.
"Shit." Mr. Shield responds. "That's quite a bit too heavy for the island's floors to handle."
A sudden cracking noise is heard near the tank.
"Run!" All Might shouts, grabbing Izuku and Melissa before leaping away.
Upon watching All Might run for it the gathering crowd flees in all directions as the cracking and groaning noises intensify. With a bang the tank crashes through the floor and soon impacts the level below. Crashing through that begins a series of crashes that end with a noticeable splash.
"Well, it could have been worse." Sam says, standing on the roof Mr. Shields lab with All Might. Earning him glares from everyone.
And fate couldn't leave such an opportunity lying now could it? The sea water flooding the sinking tank causes a short of the electrical system which somehow lights some spare auto-cannon ammo on fire. This lights the 28 cm main gun rounds and causes an explosion that lifts the entire island a few centimeters into the air before it all crashes down, sending scientists and their sensitive experiments onto the ground everywhere.
"I think I speak for everyone when I ask you not to tempt fate again Sam." Mr. Shield says before placing a hand on Sam's shoulder and giving him a look of disappointment.
It would take days to put out the fires, stop the flooding and repair all the damages. All Might wisely snuck Izuku out of the city during this excitement and told him in no uncertain terms, never to use his quirk on anything that floats again.
Some good luck from this was that the villains Mr. Shield and Sam had hired to sneak into the city, happened to be boarding via submarine as this happened, and the shockwave broke the transport tube causing it to sink with all hands. Something no one would discover for several months, until the team hired to investigate the mysterious second leak in the city found the serial number on the broken boarding tube and then sent a team to the bottom of the sea to investigate.
Devious Blackmail
"Fine Mineta. You've blackmailed me successfully. I'll create a tank and you can use it to do your dirty deeds." Izuku says through clenched teeth, internally hoping this would go wrong.
"Well? What are you waiting for? Make me a tank so I can see inside the baths." Mineta whisper-shouts.
"As you wish." Izuku sighs, raising his hands into the air.
In an instant any attempt at being sneaky was lost as the 35 meter long hull of the P1000 appeared behind them, crushing several trees and causing a general ruckus.
"You bastard!" Mineta shouts, "You did that on purpose!"
"My tanks are random and you know it." Izuku says stoically, "It looks like fate didn't approve of your lecherous plans."
"I won't hide this evidence from the teachers anymore!" Mineta shouts.
"Oh? Is that so?" An angry Kendo says as she towers over Mineta. She had clearly dressed in a hurry, her shirt and shorts were damp as was her hair.
"Oh, hello Ms. Kendo." Mineta says with excess respect in his voice.
Kendo quickly reaches and grabs the blackmail from Mineta's hands and opens it to take a look.
"Oh, you caused all that damage?" Kendo asks Izuku as she looks everything over.
"I did destroy a few training cities." Izuku admits.
"Don't worry, We will destroy the evidence for you. As thanks for exposing this pervert." Kendo says, and the other girls that were slowly walking over all agreed.
"You would have to enter my room to get all the copies!" Mineta shouts, knowing no girl would enter there.
"I'm sure Monoma wouldn't mind doing so in exchange for me letting him off his leash for a few hours." Kendo claims before walking away with the other girls to plan revenge.
Except for Momo, who had at this point climbed on top of the tank and was measuring every dimension she could find.
Quirk Assessment Fail
"Midoriya, you have the highest score from the entrance exam, come forward, you've volunteered to give an example." Aizawa says tiredly.
"Alright." Izuku says as he timidly steps forward.
"How far could you throw one of these in middle school?" Aizawa asks.
"Around forty meters sir." Izuku answers.
"Well, now do so with your quirk." Aizawa instructs.
"Ok," Izuku says before turning away and raising his hands in the air. "Come on, some luck please."
While Izuku was lucky Aizawa was not; a massive tank tread appeared on Aizawa's head and he was crushed to paste.
"Well, he was clearly a villain." Izuku says to the stunned class. "Didn't give us a hero name, and I couldn't recognize him either. He didn't let us go to normal start of year activities and forced us under threat of expulsion to show us our abilities. Clearly I've saved everyone's lives."
"I didn't recognize him either." Momo says, and the rest of the class nods.
"Well then, shall we go to orientation? I'm sure if we don't change we might catch the principal's speech." Izuku offers looking at the time.
"We should also report the incident!" Iida shouts, performing a strange chopping motion with his hand as he leads the class away.
No one noticed the P1000 turning in place to further disrupt the evidence.
Hero Training Win
"I think we should see what tank I get before entering the building." Izuku says to Ochako as they prepare to play villain in one of All Might's exercises.
"Probably a good plan." Ochako says, watching Izuku prepare to summon his tank.
They both pause in shock at the monster that appears in front of them. "Well, Gee Gee I guess." Izuku says, using outdated gamer slang.
"I'll grab the bomb." Ochako offers, "Should we put it in the turret?"
"We should." Izuku agrees.
"I want to go home." Sato says upon looking at the enemy they would have to face.
"I don't think even All Might could beat that in the time we have." Kyoka observes.
AN: Just a few ideas for a heavily requested tank. I hope you all enjoy it.
There were many other Sherman variants, but I wanted to play with Dakka this time. I'll find something for the flail tank in the future, but if I do flamethrower tanks, I'll probably use the Churchill.
What? You want more? Bonus Eri then...
Izuku was cackling with glee as he prepared to face his entire year in the Ratte he had just summoned, unfortunately on the other side of the mock city a little girl found a bit of scrap metal from the last time he created a Ratte.
"What? A second one!" All Might shouts in panic from the observation room.
Aizawa quickly jumps out of his sleeping bag and stares at the two monsters staring each other down. "Hand me the binoculars." He orders.
"Oh no." Aizawa says.
"Oh no." All Might agrees, noticing Eri's head poking out of the turret on the second Ratte.
"Oh yes!" Nezu shouts through the speaker system of the school as the two titans open fire on one another.
In a different part of the multiverse a different Izuku gets an urge to jump through a nearby wall, but resists it, as he was used to it by now.
The remaining students flee in all directions as shrapnel and shell casings rain down, Ochako and Tsu needing to drag Momo away as her legs failed her the moment the 11 inch guns fired.
At the end of the day both Eri and Izuku were sent to the time-out corner by Ochako for over 5 minutes. They both protested but in the end sat out their punishment.