Y/N was carrying her hero costume suitcase with her as she's heading towards Ryuko's agency, looking excited to see her again. Once she's inside, she head into the office and what she sees shocked her. Ochaco, Tsu, and Hado

"Ochaco? Tsu? Hado? What are you doing here?"

"Y/N?!" Ochaco and Tsu exclaimed in surprise.

"Ah, Y/N. Welcome back. I'm just here to introduce you to your new teammates, but it seems you already know them." Ryuko greeted with a smile.

"Hi, Y/N! What a coincidence! Did you know that you'll be working with us? Huh? Why didn't you tell me she would be there, Ryukyu? Did you know that she's cute?" Hado asked in excitement, coming towards Y/N.

"Gah! Stay away! Personal space! Personal space!" Y/N screamed, dodging her. "Since when do you work with HER?! Doesn't she learn her manners??"

"She may lack in manners, but she's a very good student with great combat skills." Ryuko chuckled, standing up from her seat. "Now that you're here, you're just in time for a mission."

"Really?" Y/N asked with a smile, pushing Hado's face to prevent her from coming close to squeeze her face again.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Loud crashes were heard in the city as the two giant villains jump at each other and blast each other with their Quirk. Police cars came by to see the situation.

"The villain groups are fighting each other!" Police Officer exclaimed. "There are two with gigantification Quirks! Espa Way's caught up in their fight! Send heroes immediately!"

Y/N and Hado in their hero costumes are already here on time as they were flying in the air. Y/N is using her atomic fire from her hands and feet to help her rocket boost in the air as her body is glowing while Hado is flying with golden energy in her hands as they swirl.

"Wha--?!"

"Full charge, output level 30..." Hado mumbled, bringing out her hands.

Y/N took a deep breath as she could feel her power ready to burst out.

"Spiraling Surge-- Gring Wave!"

"Atomic Breath!"

Both golden energy and flaming (F/C) combined together as they hit both the villains. The villains grunted in pain and collapsed.

"Hey, why are you fighting? Is it because your Quirks are the same? That's so weird."

"It seems like it. Kinda reminds me of my two familiar hard headed idiots..." Y/N said and turned. "Do it now, Froppy and Uravity!!"

Tsu is flying on the rock with Ochaco floating by her side as they charged down towards the two giant villains.

"Ultimate..."

Ochaco tapped her fingers as they glow pink, releasing the rubbles that were floating earlier. Tsu brought out her long tongue.

"...Move!"

Tsu slapped the rubbles at the villains, making them unconscious.

"Meteor..."

"...Fafrotskies!"

The villains were now down as the police officers looked on in shock.

"That was great!" Hado praised at the two girls. "Yeah, that was really great! Were you nervous?"

"Phew, I was able to do what I was supposed to!" Ochaco sighed.

"Kero, I was calmer than I thought I'd be." Tsu agreed.

"You two did amazing. I'm proud of you." Y/N smiled, patting Ochaco and Tsu on the head, making them blush.

"As expected of those recommended by Nejire-- You're both great at this." Ryuko smiled. "Even you, Y/N. I see you really improved yourself. How's your limit?"

"Better than ever, Ryuko." Y/N said, smiling.

Ryuko nodded and turned to Hado.

"Nejire, you've also fixed the timing for your attack."

Ochaco and Tsu bowed.

"Thank you for taking us on."

"Of course."

"Hey, Ryukyu, these two couldn't go to the heroes from their internships! But Y/N is so lucky to go to you again!" Hado spoke, pointing at them. "Did you know that first years can only go to agencies with a good track record of accepting work study students? Did I tell you?"

"Hado... The way you're saying that sounds quite offensive to Ochaco and Tsu..." Y/N said, looking uneasy.

"Even if you're still students, now that you're here for a work study, you're a legitimate part of our forces!" Ryuko said, still smiling. "You three seem like you'll be able to play an active role in that matter."

"'That matter'...?" Ochaco questioned.

"Kero...?"

"What do you mean, Ryuko?" Y/N asked in confusion.

"A request to team up from All Might's former sidekick, Nighteye." Ryuko answered.

"Nighteye's where Deku went for his work study..." Ochaco said.

"Oh, 'team up' means for hero agencies to work together." Hado added. "You knew that, right?"

"What's the request to team up about?" Tsu asked.

Ryuko's eyes grown serious as well as her expression, making Y/N had a gut feeling about this. And it's going to be big.

"The investigation and seige of designated the villain group, Shie Hassaikai. It's a big job that might lead to the League of Villains."

Y/N glared at the mention of them, especially Dr. Wu that's involved with them.

"What if they have Eri?..." Y/N mumbled, looking down.

"Huh...? What do you mean?" Hado asked, tilting her head in confusion.

Y/N shook her head.

"Nothing."

All of a sudden, they heard a scream. They turned to see everyone running away in fear.

"What are they running from??" Ochaco asked, looking worried.

"More like what is that that's chasing them?" Hado asked, pointing at something overhead.

Y/N turned and gasped to see something bigger and taller than a T-Rex.

"Spinosaurus." she said, making Ochaco, Tsu, Hado, and Ryuko stare at it with wide eyes.

The body color of the Spinosaurus was a mixture of dark and light gray, a yellowed underbelly, and red splotches around its face, across its back, and at the end of its tail. The sail had blue circles. It had pronated hands and two head crests, curved teeth like Baryonyx, strong jaws, immense strength, thick hide, a bipedal gait, and a more terrestrial lifestyle. The Spinosaurus's subnarial gap was not as wide, with many of the teeth in the gap being larger. It also had a shorter, more symmetrical sail. It has the huge sail-like fin on its back.

Y/N took a look and could tell it's a female. Spinosaurus roared as she tried to bite the citizens that are running away.

"Spinosaurus?! I thought those were extinct! It's more dangerous than a T-Rex!!" Police Officers shrieked. "What are we going to do?! I have never seen anything like this!!"

The man who's trying to run away couldn't make it as the Spinosaurus opened her jaws. He screamed before his body was snapped by the jaws. They froze as the Spinosaurus ate the man with blood pouring out. Y/N growled in anger and landed on four.

"Everyone! Move!!" Ryuko ordered, turning into the dragon as she quickly grabbed the police officers and flew them away to safety as Ochaco, Tsu, and Hado took care of the citzens, guiding them to move faster.

Y/N didn't move her spot as she glare at the Spinosaurus who after finishing her meal, glare down at her back. Y/N transformed into the Indoraptor and high pitch roared at her. Spinosaurus roared back, getting into her stance as well as Y/N. Both of them circle each other around slowly, while giving each other a roar again like they are arguing as Y/N confronted her to stay away from the people. Ochaco, Tsu, and Hado looked on in worry as the citizens who are safe watch on, while some started recording.

Spinosaurus roared at her again and whacked her off with her tail, causing Y/N in her Indoraptor form to collapse. Everyone gasped.

"Y/N!!!" Ochaco, Tsu, and Hado screamed.

Y/N quickly got up and dodged the claws that Spinosaurus tried to slash. Y/N charged and bite Spinosaurus' neck, making it roar in pain. Y/N released her jaws and moved back, snarling. She charged again and wrapped herself around Spinosaurus' neck. Spinosaurus roared and shook her head to try and to get her off. Y/N jumped away and landed on four. Spinosaurus opened her jaws wide and goes down to eat her whole. Ochaco, Tsu, and Hado were about to intervene when Y/N hold Spinosaurus' jaws with her claws before she could bite her. She struggled to hold her jaws open as Spinosaurus was shocked and tried to move her mouth away.

Y/N roared at her again and pushed her off hard, making Spinosaurus fall to the ground. Ryuko flew down and came right on time to see Y/N fending off against Spinosaurus. Y/N turned back to normal. She panted as she walked over to the Spinosaurus who was about to get up when Y/N held her down.

"Don't move, Spino."

Spino growled at her and didn't listen. Y/N growled and punched the ground near Spino's face, causing her to flinch to see a large dent.

"I'm giving you a fair warning. Leave or die."

They were having a staring contest, but Y/N's intimidation glare was much more powerful. Spino did nothing and just gave a low groan and finally, she gave in. Y/N slowly let go of her as Spino got up and shook her head, feeling a pain in her neck. She turned and trotted away, looking back at Y/N who gave her a stern look. Spino then looked away and left the city and headed towards the forest. Y/N sighed in relief, looking back at everyone who are staring at her with wide eyes as well as her friends and her intern.

"Don't worry. She's gone. She won't show her face again."

Everyone began cheering and ran over to her as they all thank her for her save, even though one is lost, they'll surely make a grave for him. Y/N was surprised and blushed, feeling embarrassed as she told them that it's no problem. One of them ask her.

"What's your hero name?"

"Yeah, who are you?"

"My hero name is Indominus Thief." Y/N smiled, looking at her friends and Ryuko as they gave her a smile.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Meanwhile, in the underground area where the same guy with a bird mask Y/N encountered named Kai Chisaki was sitting in his seat with his two bird mask people by his side. Shigaraki and Dr. Wu walked in.

"We were made to walk in circles underground for 30 minutes. I feel like I've become an ant!" Shigaraki complained.

"I have to admit. It's pretty easy to get lost." Dr. Wu agreed.

"What's up with a yazuka's house, anyway?"

"We don't know who's watching or from where," Chisaki replied, "nor do we know what our guests are thinking. A number underground routes lead here. This reception room is also one of our hidden underground rooms."

"We've been able to survive until now because of small details like this." A small, thin man in white bird mask named Mimic said. "Anyway! What you said the other day on the phone-- You meant it, right? That you'd join us and bring Dr. Wu as long as certain conditions were met."

"Don't interpret it in your favor." Shigaraki said as he sat down, placing his foot on the table along with Dr. Wu who sat down properly. "You guys want the name of our League of Villains. We want to increase our strength. Our needs coincide."

"Put your foot down. It'll get dirty. Try and be more like that doctor." Chisaki scolded.

"'Will you put your foot down, please?'" Shigaraki mocked. "That's what you should be saying, young head. You should really be bowing to me."

Dr. Wu just stay silent.

"First, we won't put ourselves under you. We'll move however we want. Half-- in other words, a joint partnership. If that's what this is, then we'll help."

Shigaraki nodded to Dr. Wu as he took out the folder that said 'TOP SECRET' and laid it out on the table.

"I'll work with you and show you my creative idea I have been working on. Two very powerful weapons you could need." Wu said.

"So those are the conditions?" Chisaki asked.

"One more thing." Shigaraki pointed out. "That plan you said you had. Tell me what it is. That's a reasonable condition. I want to consider whether or not there's merit in lending you our name."

Shigaraki started to dig something out of his jacket.

"For that matter--"

Suddenly, two guns are pointed at his head, making Dr. Wu tense and raise his hand up.

"Don't get ahead of yourself." A guy in white hooded cloak with bird mask named Kurono said. "You're doing too much of what you want."

"Who do you think you are, punk?!" Mimic angrily yelled.

"Who do you think you are?" Shigaraki glared. "One of your disposable small fry versus our Hikiishi. Those lives are not worth the same. Plus, your worth of one of Compress' arms. If we don't get some concessions from you, then it won't be worth it for us."

He was about to raise his hand to disintegrate him when Chisaki stopped them.

"Stay back, Kurono, Mimic. He and the doctor came all this way with their offer. Let's hear him out to the end. You weren't finished."

Kurono and Mimic pulled their guns away and went back to their place, making Dr. Wu sigh in relief.

"Tell me the details of your plan." Shigaraki continued. "Well, I have some idea of what it is, anyway. It has something to do with this, right?"

He brought out the red bullet.

"Right after this was shot into Compress, he couldn't use his Quirk for a while. What is this? What are you planning to do with this? Tell me."

"I'm going to break the status quo. I heard All For One ruled by stealing Quirks. I fine-tuned his method a little. I already have my roots spread out the entire country. Little by little, preparations are going according to plan..."

After Chisaki explained that the red bullet is used to destroy Quirks right after they get shot, Shigaraki then left, leaving Dr. Wu with him.

"So tell me, what's your secret weapon you have been working on?"

"Glad you asked. Ever heard of dinosaurs earlier? They have been roaming around and it's all over the media."

"I have. I have captured one that's called the Velociraptor. I was curious of how it was brought back. It tried to attack me one time, but I manage to hold it off and brought it inside with me."

"It was all thanks to me. All of this exists because of me. If I don't innovate, somebody else will. But people have been saying that I'm a mad scientist. I was only trying to bring them back to life. And now, if it's a war they want, then it's a war they'll get. That's why I created a few more hybrid dinosaurs thanks to one of my creation that escaped from me."

"Let me guess, Y/N."

"I see you have met her." Wu grinned.

"I have. Along with that other one that I never seen."

"That one you saw was the Indominus Rex Gen 2. Looks like she took good care of it."

"You're saying you're creating another hybrid dinosaur? What for? What weapon do they have?"

"Strength, speed, kill, and they're smart. I have two of these things that might interest you." Wu said, opening up the folder.

"Show me." Chisaki leaned in to get a better look.

Dr. Wu revealed two different pictures of hybrid dinosaurs with names on it.

Deinonycanis

Yudon

"Those two that you're seeing are Deinonycanis and Yudon."

Chisaki stare at it with wide eyes that this doctor can create and think something crazy.

"How are you going to make them?"

"Simple. Adding some DNAs along with some predators and others that will change the world. I also have something special to add."

Dr. Wu brought out the ziploc bag of Y/N's strand of hair that Himiko Toga cut off.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A few days after starting work study

"Kirishima, hey!" Denki called.

"Hm?"

Denki brought out his phone to him.

"Your name! Your hero's name in the news online! Wow! 'Newcomer SideKick Red Riot Bursts onto the Scene! From his first day, he takes responsibility for the citizens and fights a villain by himself.' That's what it says!"

Katsuki gritted his teeth in jealousy as red aura surrounded him.

"Congrats, Eijiro! Knew you can do it!" Y/N smiled, patting Eijiro's shoulder.

"Y-Yeah!" he blushed.

"Tsu and Uraraka, you're amazing!" Mina exclaimed, showing them her phone. "Your names are here! Let's see, 'New Sidekicks at Ryukyu Agency. Two there for a work study!'"

"Wow, that makes me happy! There it is!" Ochaco exclaimed, smiling widely, looking at her own phone.

"I wonder where they took the picture from..." Tsu said, looking over Ochaco's shoulder.

"That's amazing! Maybe you already have some fans like Mt. Lady!" Mina pumped her fist.

"I'm so jealous!" Toru squealed.

"It's true." Kyoka spoke, looking at her phone. "'And they're cute. A great achievement, taking control of a big incident in an instant... Their abilities are real.'"

Momo looked down at her phone and gasped. She ran over to Y/N's side and grabbed her arm.

"Y/N! Did you see? You're in the news too! With your hero name on it!"

"What? For real?" Y/N asked, looking over Momo's phone.

"'New Sidekick at Ryukyu Agency Indominus Thief/Dinosaur Whisperer Took Down A Hideous Dinosaur Spinosaurus! She's insane and literally made the Spinosaurus leave like she's the alpha! She's a badass woman!'" Momo exclaimed.

"What?! You're telling me you took down a Spinosaurus?!! A real one?!" Denki yelled in shock.

"No way!!" Mina gasped and turned to Ochaco and Tsu. "Did you two know about this and didn't tell me?!"

"It was rather intense to see that." Ochaco chuckled.

"It was huge and very scary." Tsu added.

"And the Spinosaurus is bigger than a T-Rex." Y/N said, chuckling. "It tried to eat me at one time, but my strength was no match for Spino."

"What?!" Eijiro shouted in shock and fright.

"You're crazy!!" Kyoka exclaimed, shaking Y/N's shoulder.

"It's true! It's even on YouTube! Check it out!" Mineta said, showing them the video of Y/N and Spinosaurus fighting. "It's like watching a live action movie!"

"You're so cool, Y/N! I'm so jealous!" Toru said.

This made Katsuki even more angry and jealous as his eyes twitched.

"Even if they only have provisional licenses, once they start working in town, they're heroes just the same." Tenya said, feeling surprised to hear Y/N fought against the biggest dinosaur in the world. "Remarkable service. However! A student's study is to study! You can't doze off in class!"

"Right, Iida! We're prepared!" Eijiro shouted in glee and turned to Izuku. "Right?"

"Yeah!"

"Okay, mom!" Y/N rolled her eyes playfully.

"Hey!!" Tenya shouted, making her laugh.

"You said your schoolwork was in trouble, but are you okay now?" Denki asked.

"The teachers said they'd set up supplementary lessons for me." Eijiro said.

"Maybe I should've gone, too..." Hanta spoke. "It seems tough to do both at once..."

"Everyone learns at their own pace." Momo said.

"That's absolutely right!" Denki smiled.

Y/N smiled before her smile was dropped as she remembered Eri. Those eyes that plead her to not leave her. Y/N held her arm, looking down not noticing Izuku was giving her the concern expression of what's been going on in her mind. Y/N still promise to find her and save her from having a same fate as hers.