Chapter 1

Izuku Midoriya sat next to his sister who was muttering to herself as she worked on a complex problem. Their mom was in the kitchen making Mercy's favorite food as it was her birthday. Izuku looked over at Mercy who had her lips pursed in a frown as she studied the paper in front of her.
"Mercy," Izuku spoke up causing his sister to look at him with her warm dark eyes

"What's up, Zuku?" Mercy asked, locking eyes with her little brother.

"When is your acceptance letter supposed to come?" Izuku asked, the small 12 year-old as he bounced in his seat.

Mercy shrugged and ruffled his hair before stretching from her position. She had been submitted on recommendations from her old boss who was a retired pro hero. Izuku stared up at his sister in awe as she froze and snapped her head toward the door. She held up four fingers and slowly put them down. As she put the last one down a knock rang through their apartment. A manic grin spilled across her lips as the siblings bolted towards the door. The 12 year old got there first and opened the door to reveal a smirking Present Mic.
"PRESENT MIC!" Izuku squealed as he bounced even faster when he spotted the pro.

"Back up, you little nerd," Mercy chuckled, picking her brother up. "Come on in Mr. Mic."

"Hey, listeners got something for this wicked cool girl in front of me," Mic cheered as he held out the letter with the infamous U.A. seal on it. Mercy gently placed Izuku on the floor before turning to face Present Mic.

Mercy took the letter with shaking hands and ripped it open. Brilliant ruby eyes hungrily devoured every word on the page, and soon a delighted gasp ripped from her throat.

"I, I got in," Mercy breathed. "I GOT IN!"

Mercy dropped the letter on the table and picked up Izuku again, spinning them in a small circle, both cheering happily.

"I have to call Captain Surge," Mercy gasped as she hastily passed Izuku off to Mic before racing towards the phone.

Izuku stared up at Mic, his eyes sparkling with wonder. Mic calmy set him on the ground before turning to talk to his mom. He could hear his sister excitedly chattering with Sir Surge. He bolted to his room to grab No. 9 Hero analysis and a pen before racing back out to where his third favorite pro hero was.

"What's up, little listener, got a request to make?" Mic asked crouching down slightly.

"Can you sign this?" Izuku asked a surprised Mic as he held out a notebook and pen. Mic took it with a smile and signed before reading what was in the notebook. It shocked him that a 12 year old could come up with something so well written and thought out at the Quirk analysis' in the book. Mic handed it back to the bouncing kid, making a mental note to bring him up with Nezu and Shota when he got back to U. A.

Mercy came back in a few minutes later a wide grin on her face. Mic and Inko spent a few more minutes talking with Mercy before he left.

"Oh, I'm so happy for you baby!" Inko cried and pulled Mercy into a hug. Mercy laughed and hugged her crying mother back, her grin softening as she smiled at Izuku. She wiggled out of her mom's hold and headed to her room, ruffling his hair as she went.

Mercy entered her room and glanced at her phone noticing she had a few missed calls from her friend Mirio. She rolled her eyes and decided to call him back in the morning. Mercy sighed and dropped onto her bed, listening to the heartbeats in the house playing a steady rhythm that calmed her down. Mercy stared up at the ceiling, humming an old lullaby she remembered her birth mother singing. Mercy paused in her humming and sat up when she heard a knock at her bedroom door.

"Come in," she called as she pulled her knees up to her chest.

Inko opened the door and smiled at the 15 year old she had adopted 12 years ago, a fond look in her eye. She held a yellowing envelope in one hand as she sat on the bed.

Mercy sat up, eyes locked on the letter in her mom's hand, nerves on fire. She had known she was adopted from a young age because of her hair and eyes. Shaky hands took the letter and opened it.

Dear Mercy,

If you are reading this then you have either been accepted into U.A. or you turned 15 or both. I'm sorry I couldn't be there to see you grow up and I just want to say I'm proud of you. If you meet your father while you're training, please don't mention me unless you have to. It was a mistake on both of our parts but I wouldn't change finding out I was pregnant with you for the world. Your father was unaware that I had fallen pregnant at the time. From what I heard after we broke up, he moved on with his friend, Hizashi. Your father's name is Shouta Aizawa and he is an amazing man.

I love you with all my heart, my dear and I wish I could be there to see you excels. In this letter I've also included a letter for your father if push comes to shove and a letter that may help you get an internship. Good luck my little jewel,

Love Mom

P.S. Hope you become a pro soon, sweetie!

Mercy swallowed harshly as she finished reading the letter from her mother, mind silent for once.

"Mom?" Mercy whispered, her hands shaking as she held out the letter. Inko took the letter and read it.

Inko sighed and wrapped her daughter in a hug. Mercy leaned into her mother, resting her head on her shoulder.

"It's your choice sweetheart," her mom whispered as she carded her fingers through Mercy's hair.

Mercy didn't say anything just snuggled into Inko, a sad hum leaving her throat. Inko continued carding her fingers through her hair, singing a lullaby under her breath. Her door creaked open to reveal Izuku standing there. Inko held out an arm and Izuku entered the room, climbing onto the bed with his mom and sister. Izuku snuggled into his sister's arms and slowly fell back asleep.

Mercy felt her eyes flutter shut as she drifted off to sleep, her mind whirring to a stop as she let her mother's lullaby sooth her.

Inko smiled down at her children, a fond look in her eyes as she watched them. Izuku was slotted into Mercy's arms with her chin resting on her head.

Inko slid out from mercy and eased her down onto her pillow before she took Izuku out of her arms and carried him back to his All Might themed room. She leaned against the door frame, just watching her baby boy sleep. Inko watched for a few more minutes before heading to her own room.

~~~~TIME SKIP TO 8 A.~~~~~

Mercy sat up in her bed, her breath coming in short pants. A shaky hand pressed against her face, fighting off the last clutches of sleep that addled her brain. Mercy blew out a breath before she climbed out of bed. Mercy stumbled her way to the kitchen while rubbing the sleep out of her eyes. Mercy moved around the kitchen as she began making breakfast for everybody. She made some sausage for her mom and Izuku along with eggs. She made her eggs with mushrooms and tofu slices (keep in mind all of this is on the fly, I have no idea what Japanese people eat for breakfast).

Mercy set up three mugs two filled with coffee and the other with chocolate milk. Mercy looked up from where she was setting the table when she heard the sound of footsteps.

"Morning, Mercy," Izuku yawned as they entered the room.

"Morning, Bunny," Mercy replied as she stirred the eggs. "How are we feeling today?"

"Neither," They mumbled as they climbed onto their chair, green hair an even fluffier mess than yesterday.

"Ok, bunny, I put some chocolate milk in your mug if you want to drink it now while I finish breakfast," Mercy stated as she kissed their forehead.

Their mom stumbled into the kitchen just as Mercy was plating their food.

"Morning, Kiddos," Inko yawned as she grabbed at her mug of coffee.

"Morning, momma," The two kids chirped.

"Here's your egg and it's they/them today for Izu," Mercy said as she placed the food on the table. "Also we need to go grocery shopping soon."

Inko nodded as her eldest sat at the table and pulled her mug towards her. The small family sat and enjoyed their meal, knowing in the coming weeks Mercy would be on her way to becoming one of the greats.

~~~~~~PREVIEW~~~~~END~~~~~~~~~~~~~~

This is only an introduction; I just wanted you guys to meet Mercy. I'll get more into her back story later. The next chapter will be the first ACTUAL chapter. Also I have a poll on my twitter. I'd appreciate it if you guys could help out as it will give Mercy's hero name.

My twitter handle is: ShadowClaw73
Mercy has three quirks: She can shape shift into any Animal whether it's real or mythological, she has a version of her father's quirk but she doesn't have to keep eye contact, and she can see the red string of fate.

The poll will be open for 6 days 12 hrs and 30 minutes. I'll update this story every Monday(hopefully).