The first matchup will be... Team A: Izuku Midoriya and Amber Aguta, vs; Team D: Katsuki Bakugo and Kosuke Adayemi! 
Kosuke sneered. They looked at his so-called partner for the battle trial. A completely unstable hothead, and who were they fighting?  The weakest kids in the class, both of them who can't even use their quirks.
"What a fucking insult. I thought hero school would be a challenge."
Kosuke huffed, turning her nose up with a grin as Bakugo was fuming, paying no mind to them as a vast dark smirk adorned his face. Hands sparking up as he glared over at his opponents.  He couldn't wait to make Deku watch him crush Amber underneath him.

Earlier that day...

Well, if I make my voice a pitch no one else can hear, it can propel the ball without killing anyone, right?
Amber thought, taking a deep breath and getting ready to scream at the ball, but nothing came out.  The homeroom teacher's hair stood up revealing his now red eyes.
"Even a pitch like a dog whistle, if it had the vibrations to propel the ball, it would kill everyone here. You're going to have to throw it without your quirk until you figure out a way you can use it.  After English with Present Mic, you'll have extra time with him to study sound and practice."
Aizawa stated bluntly, not very fond of the student Hizashi seemed so excited about. They picked the ball back up and threw it.
"42.6 meters."

Izuku and Amber, unlike the others, took the tests normally without assistance from quirks.  Seeming about equal in ability, though Amber was slightly faster and Izuku slightly stronger.
Amber:       Deku:
50-meter dash
6.30 seconds.       7.49 seconds
Grip strength
30kg.         40kg.

Present time

"Hey, weaklings! You don't stand a chance."
Bakugo yelled to Amber's face after approaching them before the training match, eyes piercing into Amber's lime ones. Amber made an O shape with their hand in front of their mouth and moved it in a stroking motion before straightening out their hand and putting the side of it to their mouth. Izuku nearly fainted, recognizing the signs as meaning: Suck my d*ck, b*tch!
"WHAT THE HELL DID YOU JUST SAY TO ME?"
Bakugo growled.
"Stop bickering like children and get the hell in there you whiny brat."
Kosuke snarled at him; he didn't even bother to look at the others as she strolled inside the building. Ignoring Bakugo's yells as he went to set up for the battle.
"HEY DON'T IGNORE ME WHEN I'M TALKING TO YOU!"
He yelled after Kosuke before glancing back at Amber and Izuku.
"Don't you dare hold back!  I'm going to destroy you both at your 100% myself!"
Bakugo stayed before returning to follow Kosuke.  Izuku began his nervous muttering, Amber put a hand on his shoulder and smiled before signing.
"Don't worry. We're the A-team, after all! We can do this! You and me, just like it's always been!"
Izuku looked up to them and smiled, nodding in approval. The two of them hugged before it was time for them to start.

The two students could seldom get along.  As Bakugo had followed his dark-haired teammate to the fake bomb. 
"LISTEN, BLISTER HANDS! YOU STAY HERE AND KEEP THOSE NERDS FROM FUCKING US OVER. I'LL TAKE CARE OF FIGHTING.  THIS IS PERSONAL FOR US!"
Bakugo yelled with a dark smirk. 
"Raise your voice to me like that, and the next thing that'll come out of your mouth will be your teeth. Got that, loser?!"
Kosuke snapped.
"WHAT DID YOU CALL ME?!"
Bakugo screamed back. 
"I called you a loser. If you care to prove me wrong, go show me if you even can take care of the quirkless weaklings."
Kosuke remarked.
"Oh, I'll take care of them, and when I do, you're next!"
Bakugo replied before running off.
Kosuke rolled his eyes as he thought to himself
'Once he fails, and those brats get to me, I get to have some fun, and shove some weaklings right out of UA.'

Was Amber scared? Of course. Adrenaline ran through every vein in their body and they were shaking. But they were excited. They were going to prove themselves with their best friend at their side. They both were going to beat Bakugo finally.
Izuku and Amber rapidly signed to each other, so they could discuss without alerting the enemy: aka; the rabid animal, Bakugo. Amber put their ear against the wall, signing to Izuku.
"Kacchan is close by, Izuku-Chan."
They looked at them sternly, Izuku signing back with:
"Are you sure it's him and not Kosuke-San?"
He came up behind them, but Amber put up a fist and shook their head.
"Careful."
They signed, unfortunately, the big baddie was already onto them.  As the blonde sprung off the ceiling and pinned Amber to the ground.  Lips curled into the dark smirk that sent shivers down their spine. 
"Come on, fight me, you sh*tty nerds! I've got your girl! You're gonna save her, right?!"
Bakugo laughed, his eyes peering over at Izuku, before back at Amber. 
Izuku was trembling in his boots as Amber kneed him in the crotch. Not long after they had gotten out from under him Bakugo got back up and pulled them into a headlock.  Amber back kicked him in the shin, causing him to grunt and lose his grip before lunging at them again. His quirk began to activate as he got more and more frustrated at Amber outsmarting his moves.

"That's it, kid! Go! Go! Go! GOOOOO!!!!!"
Present Mic cheered Amber on punching the air with excitement.
"You shouldn't show so much favoritism to one student. They already got a costume designed from you. The other students will get jealous, and it'll make you both look bad."
Aizawa bluntly criticized, though of course, that didn't stop Hizashi.
"They didn't request anything for their costume, and as I have a similar quirk, as a teacher, it was my duty to provide them with a suitable and super cool costume!"

Amber's costume consisted of a black tank top tucked into tight black shorts, a cropped yellow jacket with white stripes and padded shoulders, a headband with satellite-like speakers coming out of it, and a speaker similar to Present Mic's around their neck. Put together by knee-high combat boots. Their pink hair pulled back in a ponytail. They couldn't help but giggle at their friend earlier. His dream costume is so adorable, and there are so many references to All Might, plus his reaction to Uraraka's costume. Though they were soon embarrassed by the attention they got from getting a costume designed by a pro specifically for them.

"You damn extra! You think you're so special because you can dodge a few of my moves?!  You still ain't s***! Not now, and not in a million years! Enjoy your last day standing on those pretty legs of yours 'cause I'm going to break them and shatter your dreams of ever becoming some third-rate hero!"
Hearing that, Izuku swallowed the lump in his throat and tackled Katsuki, pinning him down.
"Amber-kun! Go find the weapon and capture Kosuke-San, leave Kacchan to me! No matter what or who gets in our way, we're going to become heroes, remember?! I won't let you down, I promise!"
Izuku tearfully called to Amber, pushing on a brave smile as he struggled to restrain the explosive boy beneath him. Amber offered a proud smile in return, giving him one final thumbs-up before running down the hall. Bakugo violently thrashed about until he broke free from Izuku's hold, then charging at him again.
"If you wanna die that badly, then I'll be happy to oblige, Deku! You've always been in my damn way; with Amber at school, and now you're getting in my way of being the only hero from our old school! I'm so sick and tired of your useless, annoying smile. Taunting me knowing that I'll never be rid of this thorn in my side! You're just an annoyance!"
Bakugo yelled, eyes filled with fiery hatred for the freckled boy before him.
"K-Kacchan, I used to look up to you and want to be you! I didn't see why Amber hated you when we were young, but it's so obvious now! It's always been obvious! You're a big, stupid jerk, and nothing but a burden to them. Always dragging them down!  Now I hope I'm never anything like you!  Because I'm going to be the greatest hero, and so are they! And unless you change your attitude, you don't have a chance!  That's why we'll win right here and now  And maybe it'll wake you up!!"

"Well, well, well. Look at what we have here.  Come to face me on your own huh? A decision you'll soon regret!"
Kosuke remarked as he stood in front of the weapon before his opponent, Amber.  The mute obviously didn't say a thing. But they did their best to stand their ground. Within mere seconds Amber realized however, Kosuke had already put his quirk into effect. The room was already steaming hot. Sweat beginning to form on Amber's face.
"Is it hot in here, or is it just how amazing I am?"
Kosuke chastised, laughing as they watched. Now sweating through their clothes, Amber thought about what to do. Amber shook their head and came in with a tackle. As if pure instinct, Kosuke elbowed their head down and locked their arms under Amber's, flipping the both of them over with Kosuke arriving on top and Amber on the now burning hot floor. Kosuke laughed as he punched Amber's face over and over.
"You can't fuck with me. Nobody compares with me, and you're just a tool so everyone else can learn that lesson, shrimp."
After giving Amber a broken nose, they had one leg up putting their boot and all their weight on Amber's left arm, while their right arm, Kosuke twisted up and pressed down on the shoulder. 
"C'mon! Scream! Try to use your quirk on me, pipsqueak!"

Thoughts rushed through Izuku's head on how to deal with Katsuki while avoiding the eruptions from his costume which granted him a longer range.
"What's the situation, Amber-Kun?"
Izuku spoke through his receiver for the test, though no answer from Amber, causing his head to become even more flooded with concern.
"You've got some nerve ignoring me!"
Bakugo snapped him out of his trance. Shooting a blast into his back, knocking Izuku down. Izuku scrambled up, crawling backward from Bakugo.

Both Izuku and Amber realized they had to use their quirks.

Amber screamed, the pain of this was enough to catch Kosuke off guard and get her off of Amber.  Amber pushing them off and rolling their twisted joints.
Kosuke rolled his shoulders around and popped some of his achy joints. A smirk on his features as he felt adrenaline rush through his veins.  Amber tried to run for it, to maybe disorient him.
"OH NO YOU DON'T!"
Kosuke laughed as they chased Amber, as she got closer to them, he drew back his arm and delivered a punch straight to Amber's shoulder.  A gasp of air entered Amber's lips as they were sent across the floor rolling before a scream exited out from the pain. With that punch, he had completely fractured and dislocated their shoulder. Kosuke's smirk had turned into a grimace as he covered his ears and offered a scream of his own, falling to his knees from the pain. Amber froze for a moment, cold rushing through their body as their heart pulsed; they screamed and put their classmate in danger.  They watched as he was doubled over in pain holding her stomach. However, they had to act fast.  Recovery Girl would heal them both after anyway.
"I'm sorry,"
They whispered before rising to their feet and going toward the bomb. With their excellent arm, they reached out, the excruciating pain becoming numb from adrenaline. 

The scream was enough to catch Bakugo off guard, now covering his ears in pain. Izuku, who had protective gear in his ears under his costume in case this would happen, saw his opportunity to finish it.
"100%...Detroit... SMASH!!!"
Izuku's fist collided with Bakugo's left cheek, breaking his neck and breaking Izuku's arm.  Amber reached out and just barely touched the weapon.
"...we...won..."
Before passing out.  Quickly rushing in was: Amber's older sister, assistant nurse: Delilah Adesina, her boss: Recovery Girl, Present Mic, and All Might. Present Mic rushed to Amber picking them up, teary-eyed he said.
"You did good, kid. Papa's proud."
Carrying them to the nurse's as All Might took Izuku, Delilah took Bakugo, and Recovery Girl took Kosuke.

Now in the nurse's office, Delilah had healed all of their injuries completely, collapsing on the ground as Recovery Girl frowned.
"You could've left Bakugo and Midoriya-Chan's injuries to me."
She lectured, but Delilah shook her head, catching her breath.
"They would've taken too much of their stamina.  they worked too hard to have to deal with low stamina. It doesn't matter how I feel. I take my tiredness with pride knowing I helped youths in their first step to become a hero today."
Delilah replied, offering a weak smile.
"You spoil them. They should learn consequences for not respecting their quirks."
Recovery Girl disagreed. Delilah's smile faded away.
"I'm doing my job."

Later that day

"Kacchan!"
Amber called out in a raspy voice, careful not to activate their quirk as they ran after the ash-blonde male. He stopped, not looking back at them.
"Izuku told me that you tried to take your life because of me.  I'm not saying this 'cause I like you or anything but... don't ever do anything stupid like that again! How are you gonna surpass me from beyond the grave, huh? I'm gonna impress you soon, and you'll see that I'm just as much worth your time as Deku. Not that I care what you think of anything... Got that?!"
Bakugo's red orbs glanced back at them at the end, and for the first time in forever, Amber had a smile for him. 
They signed:
"I'll be counting on that, Kacchan."