AN: Because I'm bad at naturally adding descriptive text for my OCs into the story, I'm going to lead with some descriptions, as well as the 7th member of class 1(2)-B:

Himiko Midoriya - Hero Costume: Her costume consists of a one piece sleeveless black bodysuit, which was created to survive her using her Transform quirk to copy someone's clothing. The rest of her costume is composed of reinforced boots, a crimson victorian longcoat, and a decorated black half-mask that covers her nose and mouth. In addition to acting as a gas mask, and general air filter the half-mask also has special tubes that allows her to insert her special blood vials into them to drink their contents.

Akira Kin - Quirk: Density Control. By touching a non-living object, he can alter the density (and weight) of an object up or down. Fights primarily by keeping 1- and 5-yen coins on him and throwing them, massively increasing their density the moment they leave his hand.

A tall man with olive skin, black hair, and bright green eyes hidden behind a pair of thin rectangular glasses.

Hero Costume: A pair of black pants and a dark purple shirt with extremely loose-fitting sleeves to allow him to keep things hidden on his arms, and a kevlar vest stylized as a grey suit-vest worn over top. The whole ensemble, when paired with his glasses, gives off the image of a professor.

Himiko pulled out the costume notes in her case and quickly read them over, smiling as she changed into her black sleeveless bodysuit. "Hey Atsuko! Can I borrow a drop of your blood?"

Atsuko paused as she was changing into her own costume. "Oh? Is this the costume piece you were telling me about?"

"Yep! I would prefer to test it here and know if it works, instead of finding out in the middle of a training exercise." She admitted, embarrassment showing on her face.

"Sure." Atsuko held out her arm, and Himiko took one of her knives out from her costume and carefully scratched her with it, drawing out a thin bead of blood. She captured it on her finger, before licking it off and activating her quirk. She felt the warmth as the slime wrapped her up, and suddenly her classmates were staring at two Atsukos, the only difference being one was in her school uniform while the other was partially dressed in her hero costume.

"Wow, so that's how your quirk works? I saw you use it yesterday but wasn't paying attention to the activation conditions."

"If it wasn't for the clothing, I couldn't even tell the difference!"

"Oh yeah, I didn't really give a good demonstration yesterday, huh?" Himiko beamed proudly as she struck a pose, continuing in Atsuko's voice. "If I drink someone's blood, I can transform into them. As far as we can tell I am pretty much physically identical to whomever I transform into, right down to their voice and clothing. If I can get someone's mannerisms down, you'd never know it was me."

"So that's why you want to go underground?" Sakura asked.

"Yeah, as much as I'd like to be visible, stealth and espionage are basically the total opposite of what the hero billboards are looking for. Plus what's the point of being able to transform if everyone knows I can do it?" She frowned at that, but quickly wiped it off her face. "Now for the drawback - when I copy someone's clothing, my own clothes become part of the transformation and won't be there when I drop it." She felt her cheeks heating up at that revelation. "But, if the support company got this right, that shouldn't be a problem anymore! Now for the moment of truth."

Himiko dropped her quirk and let her transformation dissolve into a pile of grey sludge at her feet. Looking down, her bodysuit had survived, and she cheered. "Totally worth it!"

"But what about the rest of your costume?"

Himiko pulled out a deep crimson victorian-style longcoat and put it on. "Because my brother is a genius, we planned for that when we came up with the design! It's designed so that I can pull everything else off quickly, if I need to transform on short notice." She then pulled on her reinforced boots and looped her mask loosely around her neck.

She glanced around the room at her fellow classmates' costumes. Atsuko was wearing a loose fitting jumpsuit that was primarily black, with stripes the same color as her sky blue hair running down the arms and legs. Accompanying that was a pair of custom dark blue knee-high boots, a pair of fingerless reinforced gloves, and a utility belt that, like most of the hidden pouches in Himiko's own costume, was mostly empty. Finishing the ensemble was what could best be described as a fighter pilot's helmet with part of the back cut off to allow her hair to flow freely down her back. Izuku had insisted that the two of them at least have some type of mask with filtration, and the two eventually agreed to his compelling arguments.

Up next was Emily, who looked less like a hero and more like a scientist. Her hero costume consisted of a pair of grey pants, a white shirt, and a white lab coat. Finishing the look, she was sporting a pair of thick goggles that were resting on top of her head, a pair of comfortable-looking work boots, and a crazy looking fingerless gauntlet on her left hand.

Himiko couldn't help but laugh when she saw the whole thing. "That's some costume you have there."

"Hey!" Emily crossed her arms and gave her best glare, which only made Himiko laugh at her more. "What's so funny?"

"You just - you look like you belong in a lab, not out fighting villains!"

"Well, obviously! Since my parents are both researchers I wanted to honor them and tailor my costume after their profession. It's not like you're any better, little miss vampire."

Himiko made sure her smile really showed off her fangs. "Well obviously, I've gotta keep with my theme as well."

Eventually the rest of the girls finished changing and they walked out to Training Ground Beta, finding Kan and the rest of their class waiting for them. "Yesterday we got you thinking about new ways to use your quirk, and today we will actually have you participate in a mock battle, to give you a feel for using your quirk in an actual fight. You will be partnered off randomly, and then teams will be drawn to determine who is facing who. The scenario is a simple one - one team will take the role of the villains, hiding a bomb inside a building, while the other team will be the heroes, assigned to either disarm the bomb or capture the villains before the time runs out and they enact their nefarious schemes."

After teams were drawn, Kan took the numbered balls back and began inserting half of them into a box - except for 2 of them. "While we are drawing lots to determine which teams face off against each other, we are making one exception. Since both Midoirya and Song have experience learning under Pro Heroes, in the interest of fairness their teams will be paired off against each other first. Give us a good demonstration and show off what you know!"

Himiko gave Emily a predatory grin at that, finding herself happy with this outcome. And judging by the look Emily was giving her back, she was just as happy with this. Meanwhile their teammates looked impressed.

"Man, Midoriya you're full of surprises, I didn't know you learned from a Pro!" Oda said.

"I don't really like advertising it, unlike the loudmouth." Himiko admitted. "Especially since it was the pro hero Vlad King." She saw a few of her classmates look at their teacher in surprise. "I just didn't want people to treat me any differently because of it."

Oda nodded in understanding. "That makes sense."

They were interrupted by Kan calling out to start the exercise. "Villain team, you will have ten minutes to set up and come up with a plan. Hero team, you will be given a set of blueprints for the building to examine during that same time to come up with your own plan."

As their opponents began to walk towards the building to set up, Himiko couldn't help but call out to them. "Hey Song! Just so you know, there's more now!" She saw Emily pale at that revelation and turned to her teammate with a satisfied grin. "Come on, let's have a look at these blueprints and figure out how we're going to handle this."

"Something tells me you already have a plan."

Himiko just grinned. "Well, I do, but it depends on the two of them splitting up. If we can isolate and capture one of them, then I can use my quirk to transform into that person, and from there we can take down the other in any number of ways. Their smartest strategy would be to stick together. I don't really have a plan for that." She admitted.

"Well, you're really good at fighting up close, right? I can help with that."

"What do you mean?"

Oda pointed to the blueprints. "This building has a lot of cement in the walls and floors, I can easily use my quirk to isolate entire areas, it's just a question of - can I actually get my walls up fast enough to split them up."

"That may work. I couldn't use my quirk to get the sneak attack on the second one, but I have other tricks they don't know about yet."

"Of course you do." Oda laughed. "I'm pretty good in a fight, but Song is almost certainly better than me, and who knows what kind of training Kin has."

"I'm pretty sure I can take Song if we can get her distracted." Himiko gave him a confident grin. "We just need to make that happen."

The pair continued making plans until the announcement came down that their trial began, at which point they walked over to the building and entered. The pair made it up to the third floor without incident, but as they made their way to the stairwell they saw Emily standing openly at the intersection leading up to the 4th floor, waiting for them. "There you are! What took you so long!" She calls out, before launching a bright ball of light down the hallway, forcing Himiko and Oda to dodge as it slams into a wall. The scorch marks it left behind a warning about what would happen if they get hit.

"What, can't take a little heat?" She calls out.

Himiko smiled of course she would split up, she's making it easy on us. "Plan A is a go!" she nodded in the direction of the window, and Oda gave her a thumbs up and ran towards it. She saw him quietly open the window and use his quirk on the outer wall, creating a path for himself outside the building, before hopping out in an attempt to flank Emily.

While Oda was doing that, Himiko drew out a throwing knife and ran across the corridor to the other side, tossing the knife at Emily. She heard a yelp and saw one of her projectiles hit the knife, knocking it out of the air. "What, can't you take a little stabbing?" Himiko called back mockingly after she had settled against the wall.

She heard Emily's flustered voice down the hallway. "Why don't you come out and fight?"

"Sorry, I'd rather not give you the chance to hit me with one of your crazy light arrows."

Emily just laughed at that, and Himiko could hear her voice getting louder. Good, come to me. "Remember, I don't need to defeat you, I just need to keep you here long enough!"

"Thanks for the reminder, I'll get right on letting you goad me into something stupid."

"Where's your partner? He's been a little too quiet, hasn't he?"

Himiko could hear the pieces clicking into place inside Emily's head. She looked down at the vial of blood she took from Oda and drank it, activating her quirk. "Oh I'm still here, don't let me interrupt the good time the two of you are having."

"Oh no, please join us. Unless Midoriya's just using her quirk to mimic you?"

Himiko kneeled against the corner. Crap, I did just let her know that part. Just have to get her a little closer. She heard Oda over the radio "Just got back inside, I had to improvise a way back in."

"Just in time! She's onto our plan." Himiko hissed into the radio.

"She's really far away from me, are you sure about this?"

"Yep, further from you means closer to me, and I work better up close."

"Alright on the count of three. One."

"Two"

"Three" Oda threw open the door from his position behind Emily and slammed his hand into the ground, a small wave rippling towards her as he activated his quirk. She turned around and jumped backwards to avoid the stone pillars that were shooting out of the ground, not caring that they were cutting off her escape route. Meanwhile Himiko rolled out from behind the corner and tossed two knives quickly at Emily.

She heard Emily's surprised cry as she unleashed a large bolt down the hallway to stop both of the knives from hitting her, but Himiko was able to dive underneath the blast, crashing into Emily. Unfortunately her momentum wasn't enough to knock her over, but at least it shook her off-balance. As she shot up Himiko threw out an elbow into her opponent's stomach, knocking the wind out of her. Grabbing the capture tape with her other hand, Himiko quickly worked to wrap the capture tape around Emily's wrists, being mindful to make sure that it was below her gloves.

"One down. Good job Midoriya!" The two watched as the temporary stone pillars retracted into the floor, replaced by a happy-looking Oda. "Now we just need to get that bomb."

"Your mistake was splitting up from your teammate." Himiko had a predatory grin as she dropped her previous transformation and looked down at Emily, removing her earpiece. She then bit into her arm as Emily let out a startled yelp. Quickly removing her coat and activating her quirk, she now looked like an exact copy of Emily. Himiko then put the earpiece into her own ear to complete the look.

Oda was grinning as he was looking at her. "Wow, I didn't see you copy my clothes yesterday."

Himiko grins back. "I didn't need to show off everything yesterday, after all. Hopefully I can fool Kin long enough to get to the bomb."

"Song, what happened down there?" Kin asked into the earpiece.

"..sorry, this equipment's having trouble with my quirk. I've taken care of the stabby girl, but the rock boy is following me!"

Something felt wrong about this. "Got it." He pushed up his glasses and withdrew a few coins from the hidden pouch in his sleeve, holding them at the ready.

He heard the rumbling as Oda's stone manipulation quirk was reshaping the walls, presumably to attack Emily as she was racing up to his location. He saw her fly into the room, barely dodging a pillar of stone that was trying to slam her into a wall, with Oda hot on her heels. Kin threw the coins in his hand, massively increasing their density at the moment of release and watched as they destroyed the next wave of pillars as they were forming.

"Thanks for the save!" Emily called, stopping near him. "Now let's deal with this guy!"

Akira slid another handful of coins from his wrist pouch and turned towards Oda, something still feeling off. He threw almost everything at the next wave of pillars, but saved a couple. His instincts were proven right when, out of the corner of his eye, he saw Emily quietly moving closer to the bomb, instead of assisting him. He threw his last two coins at her, only for her to dodge out of the way, spinning into a combat stance as she landed.

"Damnit, how did you know?" Himiko called out.

"That was easy, the real Emily left me here to take on both of you at once. The fact that you didn't throw yourself right back into the fight as soon as you regrouped was a dead giveaway." He smirked. "The change of clothes was a neat trick, I didn't expect your shapeshifting to be that detailed."

Himiko sighed "Oh well, time for a new plan. Oda, plan B!" Himiko called out and suddenly Kin heard rumbling as Oda activated his quirk, and he saw entire walls rising up to separate him from Himiko. He attempted to make a run for the bomb, and with a leap was barely able to make it past the wall that was rising up. But he knew it was too late when he stood up, and didn't see Himiko anymore.

Akira was frantically looking around trying to find her when suddenly he heard Kan-sensei announcing through the loudspeaker "Hero Team Wins!" He then saw 'Emily' casually walking out from behind the bomb, before her form started dissolving, leaving a grinning Himiko behind.

"I guess I need to work on my mannerisms for the rest of the class, huh?"

Kin just smirked back. "Yeah you do. It was a good attempt though!"

Himiko groaned as they were leaving school. "Izu's already got a new notebook ready and he is going to ask me so many questions about everyone's quirks, I just know it."

Atsuko just laughed at her. "What, he didn't ask you about everyone's quirks last night?"

"Last night was… complicated." Himiko admits, still unsure about what exactly happened between him and All Might. "He got back late so I managed to dodge that conversation."

"I see, so it was just delaying the inevitable?"

Himiko could swear Atsuko enjoyed her suffering, but their conversation was interrupted by another voice behind them - one she wasn't particularly excited about responding to right now either. "Hey, Midoriya, Hotoko, wait up!"

Himiko rolled her eyes while Atsuko gave her a nudge on the shoulder and they stopped to meet with Emily. "What do you want?"

Emily caught up to them. "Midoriya, I was wrong about you. I thought you were jealous of me." She could hear Himiko snort at that. "And that you had something to prove. It caused me to underestimate you in our mock battle today."

Himiko just rolled her eyes, she was finding it was becoming a common habit where Emily was concerned. "Of course you did, you're just like everyone else in your position - you've got a great quirk and everyone treated you differently because of it. And you think you're better than everyone because of it. And since one of your opponents was going to be fighting essentially quirkless, that made you think you could just take both of us."

Emily looked like she was punched in the gut at that statement - which was not the reaction they were expecting. Her face fell. "I know."

"Why?"

"Your quirk is pretty cool, but you said it yourself - it's best suited for underground work. I- I thought that if I forced you into a straight up fight, you would have no chance."

That actually angered Himiko. "Which completely ignores the fact that I had been training under our homeroom teacher for months! It should have been obvious I was never going to let you have a straightforward fight like that!"

"When I was growing up, between the company my parents keep and going to private schools, I was mostly surrounded by heroes and their children. I just sort of thought that was how things were? We were always comparing our quirks against each other. Everyone was telling me how strong my quirk was - and how easy it would be for me to be a top-tier hero."

"Of course you did, welcome the origin story of any number of assholes."

"Isn't that a step too far?" Emily almost pleaded.

"Is it? Don't you know how many kids get away with whatever they want because of their quirk? Because teachers don't want to ruin their chances to become a hero?"

"No, I don't." She admitted.

Himiko looked at her warily. She was expecting her to be far more defensive than she was acting. "If you want to be a hero you are going to have to pay more attention. I was always treated worse because my quirk is blood-based, I was forced to hide and suppress it to pretend to have a normal life. It wasn't until last year that that changed." She looked at Atsuko.

Emily looked genuinely saddened by that. "I'm sorry." she responded softly. "I never had to deal with that, everyone just assumed I would be a hero. Even at UA these last few days - everyone here is from different backgrounds, but people put me on a different level because I am a recommendation student. You are the first person to actually call me out."

"Someone needed to do it." Himiko grumbled. "And you were right, I do have something to prove. But not to you - I want the next kid born with cute little fangs and a blood-based quirk to know that even they can be a hero if they want to - that their quirk isn't a curse."

"Thank you for telling me." Emily started looking guilty. "I guess I have a lot to think about."

Himiko looked at Atsuko for support, and sighed. She could just hear Izuku in her head telling her what she should do. So she forced out the next part. "Just - think about what kind of hero you want to be, ok? Don't just be a hero because you've been told you have an amazing quirk. We have enough assholes doing that already."

Himiko turned around and began walking away.

Izuku was currently working on one of three new notebooks - his own personal notebook. Sitting next to him was his previous notebook - 'My Hero Career #1.' It was filled with support items and ideas on how to try and compensate for his quirklessness, and recently he even added a section on various types of fighting styles that he could learn.

While that notebook still had useful information, yesterday's encounter changed everything. Right now he was busy copying over all of his notes on All Might's quirk into a brand new notebook, updating the parts that he can without actually writing down sensitive information about One For All or its special properties. He also took special care to copy down every theory he ever had about All Might's quirk, as well as a few others that he had previously read but immediately discounted.

Once the euphoria wore off and Izuku was in the comfort of his bed last night, he realized that there is a huge problem staring him in the face - he's going to need a cover story, and a good one. Not only is he going to have to explain how he manifested a quirk at the age of 15, he's going to have to come up with a good explanation for what that quirk is, preferably without making people think that it was the exact same quirk as All Might's.

His organization was interrupted when he heard Himiko come in, and with all the joy of someone awaiting execution, announced "Izu, I'm home, and we had combat trials today."

Izuku found himself smiling. As much as Himiko teases him about his hobby, and can only take his quirk analysis in small doses, she still supports him. Even if she complains the entire time. Shoving his special notebook into the back of a drawer, he picked up the second of his new notebooks "Hero Analysis for the future: UA edition #1"

"Coming, Himi!"

He has ten months to figure out a cover story, but for right now, there are 18 new quirks for him to learn about.

AN: Himiko may be projecting Bakugo onto Emily a little bit.

Ironically, of the OCs in class 1(2)-B, Emily is probably my favorite to write.