For newcomers and returning readers: Hello there! My name is Merlin and as you can see, I have decided to return to fanfiction by writing what some consider to be the scum of the world of fanfics, an SI-OC fanfic! Hooray! I disagree heavily with that sentiment, as are you if you decided to click on this, well, probably, maybe just a bit? Anyway, this is my take at this popular trope that seems to pop up everywhere on this site, hope you enjoy!

For returning readers: I'm sorry that I haven't updated any of my other fics in a while, but, to be frank, Fate has become slightly dull after all this time. I cannot promise another chapter for my fics, but I am slowly starting to come back into the groove of Fate so there might be one in the coming weeks or months.

About this story: This idea came to me on a whim after I watched a video on Shigaraki Tomura's Origin Story. I wanted to write a fic with it going about differently, but had also been wanting to write an SI-OC for a few weeks. I decided to let myself go wild and write this little piece of fanfic. A world where Tenk Shimura tries to become a hero despite his father's protests...

Summary: Waking up with the memories of an adult man from a dimension where his life was simply ink on paper was surprising to say the least. He wouldn't look a gift horse in the mouth though, he'd use the knowledge and become the hero he'd always wanted to be. Tears streamed down my face as I looked at the horrified gazes that followed my hands. 'I-It's not my fault!' The words were there, but they were not heard. Blood flowed down my face as the harsh truth that had turned Shimura into Shigaraki hit me; there was no hero to save me from myself.

I blinked owlishly as I woke up slowly from my deep slumber and took notice of my completely unfamiliar surroundings.

I was in a decently-sized room that was slightly spartan in its design, if not for the multitude of toys that filled it. My eyes were drawn towards the floor where I remember-I didn't-placing my pro-hero memorabilia to hide them from my-not mine-father.

A strand of black hair fell in front of my eyes and I froze as a wave of incomprehension filled me. My hair was certainly not black. Nor was it smooth enough for it to fall in my eyes, on the contrary, my hair was so curly that it clung close to my head.

Panic filled me as I swung my legs over the side of the bed and promptly fell down on my face, clearly not used to his legs being so short. Why the hell were my legs so god damn short?! I was six feet tall for God's sake!

I got up on my feet carefully and slowly walked towards the only door, ignoring the sharp and demanding need to scratch my neck. My hands wrapped around the handle so that I could push the door open to be greeted with the sight of an empty hallway, a few flowers that mom said she loved-how do I know this, that's not my mother-filled a few vases that I knew had a few other siblings in the house.

I rushed towards the door that I somehow knew was the one for the bathroom, deep-rooted instincts keeping me quiet as to make sure not to wake anyone. I quickly pushed the door open and slipped inside the bathroom, closing the door behind me.

I turned around and faced the mirror placed over the sink. A low growl escaped my throat as I realized that I was much too short to see myself. Yeah, no way being short would stop me from reaching my goal. I grabbed the edge of the sink firmly and pulled myself up, straining greatly. A low sigh of relief was let out as I managed to sit on the ledge and turn around to look in the mirror.

This body was strange, I decided. It looked like it had brown eyes, but they had a strange red tint to them that I had a feeling would quickly overtake the brown. I had soft black hair that was kinda messy but in a controlled sort of way with a fringe coming down my forehead. And then came the feature that immediately made me understand where I am and who's body I had hijacked. Heavy bags and small scars surrounded my eyes, most probably from scratching them too much.

Tenko Shimura's five-year-old face stared back at me from the mirror and made me realize what had happened. Fucking ROBs, you gotta hate them. Well, at least I wasn't Mineta, though that might be preferable than having All For One's constant attention placed on me.

I'm not stupid. I know that there is nothing I can do about this, so I'll look at it positively and try to make some plans. Okay, the first step on my plan to survive and fuck over All For One is to not accidentally kill my family. How lucky was I to have researched Shigaraki's origin story just a few days before getting transported into his body?

Anyway, I'd have to be careful not to place five fingers on any living thing, or anything now that I think about it. Shigaraki's Quirk was a lot more powerful when it first activated because, after the death of his family, the trauma caused him to lock away part of his Quirk's power with him being none the wiser. His-my-Quirk could actually spread instead of just disintegrating whatever it touched, which is how he had managed to rip apart half a city later on in the manga.

I continued to ponder on any new ideas to help further my plans as I walked back towards my room and laid down in the bed once more to wait for my family to wake up and start the day. My thoughts usually revolved around dismantling the League of Villains before it could even start up. I played around with the idea that Dabi is Touya Todoroki and would hopefully not turn to villainy if he had a friend, problem was that I had no idea how to contact him. I could just hope that he tried to go for U.A just to spit in his father's face, just like I would now that I thought about it, but that seemed unreliable.

Helping Twice would be easy as long as I got past the initial hurdle of finding him, the poor man just needed a friend and I would gladly oblige once I find him.

Helping Toga might prove to be slightly more daunting of a task since she actually enjoyed hurting people and killing them, but if I managed to find her at a young enough age and teach her morality and maybe push her towards the path of a hero(maybe seeing a hero centred around blood, like Vlad King would give that last push).

For Spinner, I would just kill Stain before he managed to make an actual impact on the hero community. I didn't have to worry about anyone finding out I killed him if there was nothing left of him. The mass media would just assume that one hero had been enough for the man, or that it had been a personal vendetta against the first hero he killed.

For the others, I had no idea how to help them and would simply hope that they didn't join the League of Villains if it even existed in this world after all the efforts I would put towards dismantling it before it even began.

Another thing I wanted to change was Eri's path in life. No way I would ever let a kid suffer in the grasp of that monster Overhaul for that long. Once I was a hero, I'd keep a close eye on the Shie Hassaikai so that when Eri arrived I would be able to start the raid on the facility earlier.

Any further thoughts were interrupted by the door slowly opening, letting my older sister enter happily. Hana dashed towards my bed and quickly jumped on to lay down next to me. I let out a squeak of surprise, this body's mannerisms quickly overtaking my own, as my sister promptly glomped me in a tight embrace that I feared would break my limbs. "H-Hana-nee!" I managed to croak out as I pretended to start to faint.

I heard a fake gasp escape my sister as she let go of me and proceeded to cry fake tears. "Oh no! My dear Ten-Ten!" She cried out in a 'woe is me' voice, a small hidden grin covering her face.

I let out a hearty laugh and jumped to my feet, striking a heroic pose. "Have no f-fear, citizen, I am invincible!" I declared in my most heroic voice, the effect ruined by my stutter, though my sister clearly didn't seem to care as she swooned.

A brief moment of silence passed between us before we started giggling hysterically at our impromptu skit. "Happy birthday, Ten-Ten!" My sister finally said after our laughs had died down. I glanced at her in confusion and tilted my head, clearly asking her what the hell she was talking about.

Hana giggled once more and flicked my forehead, eliciting a small 'hey' from me. "Did you really forget your birthday again, Ten-Ten?" She mocked without any true heat, poking my cheek to accentuate her mockery.

As a smart and mature adult stuck in the body of a child, my dignified answer was to blow a raspberry at her and swat her hand away, it made the itching worse when somebody touched my skin.

My older sister simply offered a small smile and grabbed me by the wrist, pulling me out of bed. "Hey, w-what are you doing?" I stuttered out, mentally cursing this body's inability to speak without stuttering.

"I'm giving you your gift, silly!" She whispered as she continued dragging me along while I made sure to keep my hand as far away from her skin as possible. "But you gotta keep quiet though, Papa will be really mad if he finds out," Hana explained quickly as she opened the door to our father's study.

My eyes widened as I realized what was happening, this was the day. Today was when I would unlock my quirk. My eyes drifted to Hana and my heart clenched tightly. It seems as if I had misunderstood something. I was not an adult man stuck in Tenko's body. I was Tenko, but one who had gained the memories of a man from another world, one in which his life was nothing but entertainment for millions of people. That was why I still loved my sister, my mother and my grandparents.

I let out a small squeak as something was suddenly shoved in my face, a picture from the little amount I could see. I had already guessed what the picture was going to be, but the moment I actually saw it, my breath was stolen away.

Nana Shimura became Tenko Shimura's idol at that moment, her huge grin filled him with warmth and told him to never give up his dreams. The manga had not done justice to the sheer admiration that filled my soul.

This was when he truly understood what he wanted to become in this new world.

A hero whose sole goal was to protect.

Little did I know how impossible that would be.