Hey, guys. So, this is something I had in mind. Ben in the world of My Hero Academia. Thought maybe it can be fun. Also, Izuku is a girl, and it's a small harem.

I don't own Ben 10 or My Hero Academia.

Ben's Hero Academia

Chapter 1: A World of Heroes?

Earth, Omniverse Universe

Ben was at Plumber HQ. He was here because he was called in, along with other free agents, for the showing of a new invention. The thing was, Blukic and Driba made it, so it might end badly.

As he was sitting in the front, he saw that Max, Gwen and Kevin were with him. Then, it started.

"Ladies and gentlemen, plumbers of all species! We thank you for coming to witness our newest invention!" Driba said through the microphone, with not getting much reaction.

"Driba, I think they're scared of something bad happening." Blukic said.

"Yes, I believe you are correct." Driba said, than cleared his throat. "We know that throughout the many years work it with the Plumbers, most of our inventions were, um, bad."

"Yeah, like the Plumber-bot that destroyed most of Mt. Rushmore." A Plumber said.

"Or the time you made a laser that almost blew up the prison level." Another said.

"Yes, yes. Those were bad inventions, but this one will be different than those others."

Everyone wore protective gear just in case this blew up. Then the two Galvan scientists had two guys roll something on stage.

"We have created a device so powerful, the science behind this made it almost impossible." Driba said. But than Blukic talked.

"Impossible? It was easy. We used Einstein's theory and continued it. It wasn't hard at all." He said, getting an angry reaction from his partner.

"Blukic!" Driba said. Blukic was the look and didn't was he did wrong. So, for two minutes, they argued until Max got their attention.

"What did you guys make?" He asked.

"Oh, right." Driba said. "We have created ...a dimension portal!"

The veil was taken off to reveal a circular portal opened. There was a Galvan sized computer console next to it.

"A What?" Kevin asked, not seeing anything like a piece of technology before.

"We call it the Multi-Interdimensional Doorway, or MID for short." Blukic said.

"This device can take anyone to any dimension. We calculated that there are multitude worlds that are like ours, and some that are significantly different." Driba said. Everyone was getting tuned in.

"Now, since there are many multiverses, we made the random world finder to find what we input here." Blukic said, turning some dials and pressing some buttons. The portal activated, and a pathway was open.

"There. Now we turn on the randomizer and let it do the work." Driba said, pressing a button on the console.

The computer ran some algorithms, and a new portal appeared. The plumbers were astounded by the two.

"Let's see. What world is through the portal?" Driba asked his comrade.

"Let's see." Blukic said, getting the coordinates. "World H1. A world of heroes. Huh, would ya look at that."

Everyone was in aw at the machine. But then, it started to spark out abit.

"Uh, Driba? Did you calibrate the circuit spectrometer?" Blukic asked.

"Of course I did. Did you synchronize the galvanic sub engine?" Driba asked.

"Oh. I forgot." Blukic said. Everyone had shocked faces.

"Blukic! How the machine will overload and suck everything in!" Driba yelled at him.

"My bad." Blukic said sheepishly. Then tried to turn off the machine. "Uh-oh."

"Uh-oh?! What do you mean uh-oh?!" Driba asked.

"The capacitor overloaded. Meaning whoever isn't out of here in 20 seconds will be sucked in." Blukic said, getting everyone a reason to go. Except Ben.

"Wait! Maybe Upgrade can help." Ben said, turning on the Omnitrix and selecting Upgrade. He then slammed the watch, turning into the Mechamorph.

"Ben, don't do it! The portal will take you to the world the finder was on!" Driba told him.

"It'll take weeks to find you in the multiverse, Ben!" Blukic added, but it was too late as the machine, with Upgrade still trying to stop it.

Everyone was silent as the machine, and Ben, were gone. Max, Gwen and Kevin were stunned that he was gone.

"Well, That ain't good." Blukic said, getting everyone to stare at him.

"Where did Ben go?" Gwen asked the two.

"Well, if our calculations are correct, he will arrive in the last world the world finder found." Driba stated.

"Well, can't you guys make another on to bring him back?" Kevin asked.

"We'll try, but it took months of research and experiments to make it work." Driba said.

"Well, I hope Ben will be fine, in that world." Max said sadly. He hoped Ben wouldn't get in trouble.

Earth, BnHA universe

Ben, as Upgrade, got up groggily. He didn't know how long he was out.

"Oh man, how long was I out?" He asked, then checked his surroundings. He woke up in an alleyway. "Great."

He got up and saw that the MID was damaged. The computer blew up and the capacitor was damaged to help. He groaned at the damaged doorway machine.

"Great, now I'm in a world I don't know. Just wished Paradox was here to help." Ben said hopefully. "Well, can't let this thing out here."

Ben turned to Grey Matter, and found the shrink function of the MID. He pressed it and the whole thing shrunk to the size of a small toy.

"Well, that's that." Grey Matter said, turning back to Ben. "Might as well check out this world."

Ben walked the alley and tried to find a way out. As he walked, he needed to get an understanding of the place he was in.

'Blukic and Driba said that this was a world of heroes. So, if there are heroes, then I can tell them who I am and maybe they'll let me do my thing.' He thinking as he found a way out.

He got out of the alleyway and saw many buildings and such. He walked down the sidewalk trying to see where he is ...only to get knocked over by someone.

"Ow!" He cried as he felt the person on top of him. "That hurt!"

He opened his eyes to see the jerk that did it, but the person that ran into him...was a girl! She had green hair, fair skin, and a c-cup chest, which he felt on his chest. He saw what was a school uniform for girls: a shirt and skirt, with long socks and shoes.

The girl groaned as she got up. The girls eyes opened to reveal emerald green eyes. She looked down and looked at Ben in the eyes.

"Uh, hi." Ben said. "Um, can you please get off? You're sitting on my chest."

The girl saw that she was on top of him, and squeaked as she blushed brightly and got off.

"I'm so sorry!" The girl apologized. "I was running late, and I didn't see you when I was running!"

"Uh, it's ok. Just try to watch out for anyone next time." Ben said as he got up. "I'm Ben."

"I'm Izuka Midoriya." The now named Izuka introduced herself. "You're not from around here, are you?" She asked.

"What gave it away?" Ben jokingly asked.

"You're from America." Izuka said, then looked at her watch. "Oh no! I'm gonna be late for school! And I have to be there in 15 minutes! I'm gonna be expelled!" She cried.

Ben felt bad for her. Then had an idea. "How about I help you?"

"Really?" Izuka asked. "After I ran into you like that?"

"I've been hit by worse. Just leave it to me." Ben said turning on the omnitrix.

'What's he doing with that watch?' Izuka thought as Ben searched through the watch. Just as he picked something, the ground started to shake.

"What's happening?" Ben asked.

Than they saw a really big guy fighting down people on a railway. There was a large crowd of people watching.

"Alright! We got some heroes to help us!" One civilian said.

"Get him!" Another shouted at the people.

"Whoa. Who are those guys?" Ben asked, getting a surprised from Izuka.

"What? How do you not know who they are?!" She asked, flabbergasted at him.

"You said so yourself, I'm new around here." Ben told her, making her remember how they met.

"Oh. My bad." She said. "Well, those guys fighting that guy are the pro heroes." Izuka said, pointing to the costumed people.

Ben looked at where she pointed. There he saw a few that made him think of what his alien forms do.

One hero was a tall and muscular man, who wore a caution patterned headband, a shirt that was opened in the middle, exposing his torso and abs, gauntlets on both of his arms, a belt with the same color and blue pants with boots. He held up a broken train light.

"Wow! Way to go, Death Arms!" One civilian said.

"Death Arms? Kinda scary for a hero." Ben said. 'Though, Ghostfreak is also a scary name as well.'

He then saw another hero, yugioh this one looked like a firefighter, except for the cannon from his back, a white mask on his face, red tape on each of his arms, and yellow sneakers. He made a water perimeter along where the people were watching.

"Everyone, please stay back! This area is far too dangerous." He said.

"Whoa, the rescue specialist, Backdraft is here? He'll make sure we're okay!" A civilian said.

The two walked up to the crowd, where one guy was talking to another about the bad guy going full monster in the middle city the city.

"Wow. Those guys are pretty good." Ben said. 'Those they don't compare to what my aliens can do.'

"Yeah, aren't they amazing? I've always wanted to be a hero, just like them." Izuka said, getting Ben's attention.

"You want to be a hero? That's a pretty good dream." Ben said to her. Then he saw she had a sad smile. "What's wrong?"

"It's just… my dream won't be a reality any time soon." Izuka told him. "You see, I wasn't born with a Quirk."

"Quirk? What's that?" Ben asked, not knowing what she meant.

"You don't know what a Quirk is?" Izuka asked. "You don't keep up with the news, do you?"

"No. Not as much as I watch over shows on tv." Ben replied. "Can you tell me about these quirks?"

She sighed. "Quirks are special powers that people are born with. 80% of the world population are born with quirks. The other 20% aren't born with them."

Ben went wide eyed. 'Born with powers? So this is a world of heroes.'

"I wasn't born with a quirk, but that won't stop me from achieving my dreams of helping people!" Izuka said with determination in her voice.

'Wow, She sounds like me when I had first used the watch.' Thought Ben, knowing she will achieve her dreams somehow.

Then they saw another hero come in to join the fight. This hero wore a blue jumpsuit that had a wooden belt, knee pads, and shoes. He also had a rose veil hanging from his left side.

Then a group of fangirls squealed at the hero. "It's Kamui! We're your biggest fans!"

"Who's that guy?" Ben asked Izuka. 'These hero names are a little better than my alien names.'

"That's Kamui Wood. He's the newest hero on the scene." Izuka replies.

"Seriously? Death Fist? Backdraft? Kamui Wood? Do they really call themselves those names?" Ben asked.

"Yep! They are proud to be called by them, because a hero is not a hero without a name." Izuka said.

The villain gets angry and tries to hit Kamui. Ben then thinks about the abilities.

'So, most of the heroes have many abilities like my aliens. And they all call themselves by what their powers do.' Ben thought, looking at the fight.

"Assault, robbery, and the illegal use of powers during rush hour traffic. You are the incarnation of evil." Kamui told the villain, which made Ben think.

'Really? Illegal use of powers? This world is seriously different.' Ben thought.

"Yeah, most people with Quirks used them for doing bad than good." Izuka said.

Kamui then spreads his arms to many branches. Izuka gets excited for this. "There! His special move! The pre-emotive…"

"...binding…" Kamui continued as his arm branches grew bigger.

"Lacquered Chain Prison!" Kamu And Izuka said at the same time, his arm branches were in to bind the villain when suddenly…

"Canyon Cannon!" A female voice as a giant suddenly kicked the villain off the tracks. Everyone was surprised by this, even Ben.

"What the what? Who's that?" Ben asked Izuka.

"That's Mt. Lady. She's a new hero too, with her quirk being Gigantification." Izuka told Ben. "It's makes her grow big to attack bigger opponents."

'Kinda like Humungousaur And WayBig.' Thought Ben as he saw her. She went back to normal size and saw that she was hot. Her suit didn't leave much to the imagination: a skintight purple and cream colored bodysuit, with orange stripes. She also had a domino mask with some brown protrusions on the sides.

Ben had no idea women would look like this in any world. He just hoped no one does something.

*meanwhile*

Unbeknownst to him, someone was watching. The person was not pleased by his subordinate's failure at a simple job. It, He was glad that one person saw the fight.

"So, Ben Tennyson is in this world, at last. Time for the hunt yet again." The person chuckled as he whistled for something.

*with Ben*

Ben was silent as he felt the ground shake faintly. 'There is something under us.' Thought Ben.

"Ben, are you alright?" Izuka asked. She saw that his face spoke fear.

"Izuka, listen." Ben asked her, getting to the ground and putting his ear to the concrete.

"What's wrong?" Izuka asked, not knowing the thing was coming up. He reacted quickly.

"Get down!" Ben told her, getting her and ducking away, while a giant monster came up and roared.

Everyone, including the heroes and the villain, were surprised by this monster.

"What the hell is that thing?" Death Arms asked. "Kinda looks like a centipede of sorts."

"Actually, it's a Terradino Centipeedle." A voice said, making the heroes turn around. "Kind of a nasty creature to use, but its usefulness can be fully utilized ...when its full."

The villain gasped at Who this was. "Boss, I can explain."

"There is no excuses for what you did. You were supposed to keep them away, but I guess it was too much. Now, it's feeding time." The person said as he whistled for the centipeedle to come.

"Mr. Khyber, no! Please, give me another chance!" The villain said, revealing the person's name as one of Ben's enemies.

'Khyber?! That's impossible!' Ben thought, thinking it was impossible for one of his enemies to be here.

"No second chances." Khyber said, removing his cloak, revealing him wearing bone armor, and having four holes in his jaw. "Now, you're my pets food."

"No!" The villain said, running away. But, it was futile as the Tyrannopede shot a string webbing at him, then getting pulled by the beast as it's mouth open and the villain screamed as he was swallowed by it. Everyone was scared now, except one person.

"Khyber! What and how did you get here?" Ben yelled and the hunter, making everyone look at him.

"Ben Tennyson." Khyber said, jumping in front of the crowd. "Eon said you would come sooner or later."

"Eon is here? Now I get it. You're still upset that your greatest in the universe escaped through your fingers." Ben taunted him.

"You are still my prey. But now, this world is my new quarry. And soon, you'll be my trophy." Khyber finished, while whistling his pet to stand next to him. "Have fun."

Khyber teleported away, causing Ben and the centipeedle to stare at each other. The centipeedle growled at him, not completely full. Ben smirked at it.

"Ben, get out of here! You'll be eaten!" Izuka told her new friend. Ben smiled at her, a smile that said 'I got this.'

"Don't worry. I fight this guy before, I can do it again." Ben told her, activating the Omnitrix. He scrolled the list as he found the alien to use. "It's hero time!" He exclaimed as he slammed the watch and was bathed in green light.

Hey guys. This is the end of chapter 1, and chapter 2 will continue with what happened.

See you guys later.