The room was filled with woes and tears as children had gathered around a single desk. A lone, small metal barred cage sat atop.

Inside, a white rabbit laid dead.

Two adults, man and woman, silently grieved for the animal while comforting the little ones. Small backs were rubbed, hands sloppily wiping dripping snot and salty fluids, and cries echoed across colorful walls.

Yuki the white rabbit was found limp and cold this morning. How is unknown. The animal's health was just perfectly healthy yesterday. No external injuries tainted its pure snowy fur.

It was so sudden.

As the class wept and whine, a pair of footsteps softly entered the dimly lit room.

The caretakers noticed the familiar presence. One of them, a male, looked towards the dark doorway.

"Tsumugi-chan..."

A little girl clinging to her backpack straps met his gaze evenly. "Sensei, what's wrong?" As she asked this, she looked past the children and spotted a white fuzzy lump lying behind steel bars.

He lowered his chin sadly. Some of her classmates looked over their shoulder to find the girl watching them from the door frame.

Her indifferent stare was dry and unwavering while accompanied with thin lips.

From among the students a boy gritted his teeth.

"Why..."

All heads rose and tilted to him.

"Aren't ya sad?! Why're you not crying?!" Exclaimed the boy whose tears trickled down his cheeks and eyes puffy.

Upset, the female caretaker frowned. "Leo-kun..."

However he continued, "I remember. You took care of Yuki last time! You did it, right?! B-Because of you, Y-Yuki is..." He broke in hiccups afterwards.

All children looked at the lone girl.

"Is it true...?"

"R-Really?"

Murmurs begin to spread among the children until the caretaker man spoke up, "Everyone, it's not Tsumugi-chan's fault-"

"What about it."

This time all eyes, including the adults, set on the child.

Gray eyes of steel were hollow under the shadows.

"Do you hate me if it was my fault?"

[Months later...]

"Summer...is soooo hot..."

The sun blazed high in the clear blue skies on the afternoon streets of Japan. Cicadas blared every second no matter where the hot soles of her shoes lead.

While treading down the streets, 5-year old Tsumugi spotted a commotion occurring in the playground just a block away.

A light gasp escaped her before she ran to the source.

Entering the grounds, the raven haired girl witnesses three boys about her age use their quirks on a single boy who clearly had the disadvantage in a fight.

Furious, Tsumugi charges in.

"Stop it!" She stands in front of the fallen victim about half conscious before spreading her arms out in a halting gesture.

Everyone stopped what they were doing and eyed the new presence.

"Who are you?" Warily said a boy with branch-like fingers pointed at Tsumugi. She almost inched her head away as she thought of the prospect of getting poked with his hand. However her determination didn't waver.

"Never seen her before..." Another boy with large red bat wings watched from midair, flapping them occasionally. It was somewhat odd to see a child's plump body being supported by a pair of wings so easily.

Tsumugi glared. "Enough's enough! I'll tell the adults what happened here!"

"Oi..."

The third boy had stepped forward. He seemed to be the leader of the little group as he had the aura that demanded her obedience.

He's an unpleasant person she would never expect to get along with so nicely.

From the palms of his hands, embers and slithers of black gas popped and crackled like firecrackers.

Crimson red eyes glimmered arrogantly as they smirked mockingly at the raven haired girl.

"Outta my way!"

Tsumugi curls her hands into balled fists before pulling her arm back...

...

Sweat dripped her skin as the merciless sunbeams only worsened the burning soreness reverberating with every breath. Everything seemed to have become hazy in her eyes.

A shadow loomed over her head. Tsumugi could make out a spiky silhouette and peering red eyes.

The boy with the quirk she discovered was explosion had a disappointed frown. "So lame. Giving up already?"

No response.

He continues, "You're... quirkless, aren't ya?"

Tsumugi's expression stiffened ever the slightest. It was enough to satisfy him.

The ash blonde-haired boy then grinned smugly. Initially the girl had predicted he would take advantage of her defenseless self and spark another fight. However what he said next surprised her.

"But you ain't a crybaby like Deku."

The dark-haired girl squinted confusedly. Before she could inquire, the boy already turned around and began to leave the playground. She heard his two fellow companions voice their confusion as they distance themselves away from the scene.

Slowly tilting her head from one side to another, she confirmed the trio's absence and sat up. She winced from the scratches he inflicted on her arms and face, though the injuries weren't serious for them to bleed.

Tsumugi glares at the hot ground past her feet, softening to a sad gray glimmer resting on her toes.

A sudden realization came to her when she looks towards where the victimized boy had laid on the ground face up.

She nearly forgot about him!

Rising to her feet, she approaches him with occasional grunts in her steps.

Tsumugi leans her head to peer over his freckled face coated with dirt, sweat, and injuries. Half-lidded green eyes continued to stare into space.

Hesitantly she began, "Um..."

His consciousness left him by then.

...

The boy awoke to the sharp wet chill crawling his cheek.

His eyes shot open from the touch. In one swift movement his body sat up.

"S-So cold!" He said while slapping his hand on where the area was cooled.

Noticing a presence close to him, he rested his gaze on an unfamiliar face.

A girl about his age stood in front of him with a water bottle outstretched to him. In her other hand was another matching bottle most likely for herself.

The freckled boy blinked before recognizing the few band-aids plastered on her cheek and bare arms and hands.

Concern and worry soon struck him as he widened his eyes.

"A-Are you okay? Is it painful right now?" He asked.

Surprise entered her gray and double black-ring irises, lips partly opened. In the next moment she regained her calm visage and said, "I should be asking you the same thing. I'm fine, thanks. Here, take it." She inched the bottle in her hand closer for him to take.

Now realizing he had delayed her, the boy accepts the cold drink from her cool wet hands.

"Th-Thank you..." He said, enjoying the contrast of temperature spreading from his fingers to his body from the summer climate.

The raven-haired girl nodded once before settling on the free space beside him.

An awkward silence ensued between them as the two children drank from their respective bottles. One nonchalant and the other timidly.

"What's your name?" Asked the girl who broke the silence.

Surprised, he shifted from his spot on the bench and glanced away before shifting to her and away again. A light blush tinted his cheeks.

"I-I'm Midoriya I-Izuku. It's nice to meet you. A-And thank you for saving me."

She shook her head. "I didn't save you though." She just got completely defeated by the kid with the explosive hands and instead only received a beating. Common logic was so obvious not to fight against someone who has a quirk while she doesn't. Some savior she was.

She sighed softly to herself, ashamed and frustrated for several reasons.

He seemed to have paused for something, confusing her. Before she would ask, he then said, "You were like a hero!"

The short-haired girl became dubious. "A hero? No way."

She waved his words off dismissively but he continued with twinkling eyes, "I saw you. You looked so heroic when you protected me back then! You took care of my boo-boos too," He points to the band-aid below his eye, "And you even fought Kacchan!"

Her dark brow rose. " 'Kacchan'?"

Izuku bobbed his head. "Mm! He's my friend. He got his really strong quirk that goes boom!" His bright expression soon crestfallen. "Ah...Right. His quirk..."

The female watched his mood change from admiration to what is akin to sadness and betrayal. For a moment she didn't say anything, despite having many remarks and questions forming in her head.

Instead, she held her hand out.

"My name's Kuroyanagi Tsumugi. You can call me Tsumugi. And...I can be your friend if you like..." Her eyes looked elsewhere, almost as though she's flustered.

Izuku stared at her open palm, gradually processing her words. He broke into a wide smile and shook her hand enthusiastically, surprising the girl.

"Let's be good friends, Tsumugi-chan!"

Tsumugi was speechless. Her expression was shadowed by her bangs. She lowers her chin and nod.

"Yeah..."

...

..

.

[The first page...

Hello, I hope you enjoy reading "Obsolete Serendipity" from here onwards~ I wanted to create my own MHA OC fic, since I'd like to join a fair number of them in the fanbase

Although I did get tired of reading OCs with quirks. I haven't seen any quirkless OCs yet, so I took matters into my hands.

Important: Tsumugi will NOT be a Mary Sue by any means, especially if she obtains a quirk in the distant future. However, rest assured, Tsumugi will NEVER recieve a quirk at any point in the story. I already planned her development and most likely it won't disappoint you. If she did receive one, that's just poor writing.

I already have her Hero AU quirk and design planned (and of course her Villain AU), but I don't think I will write a separate story for Hero! Tsumugi AU. I would use a completely different OC if I want to go that route, but with Tsumugi it's not highly likely.

If you like OC fics, then please keep in touch with this one!

This chapter may be slow or not exactly interesting yet, but of course I intend to make it exciting in future chapters.

Disclaimer: I own nothing but my OCs.

Genres: Friendship, Drama, Angst (Most likely, though I never wrote angst before), Family, Romance (SUPER lowkey though), Humor (at least I hope. I don't know how to create humor myself *Cries anime tears*), Hurt/Comfort

Pairing(s): Definitely mild OC X Izuku, considering the two are quirkless (well, one used to be). As someone who prefers to stay away from romance, I can say their relationship won't develop into a couple. Right now they will be a platonic best friend ship.

Warning(s)/Note(s) to make: Sporadic updates. Lots of subtle and not-so subtle foreshadowing. This is all in 3rd POV. There will be several POV switches I have to deal with, hence 3rd POV.

Please fave, follow and/or review for more~