Colour Coded (BNHA fanfic ft my OC)

Kimetsu no yaiba crossover test ( spoiler alert!)

" Stay alert." Night eye reminded the two students as he and his sidekick took the lead. The estate was much larger than expected and the stuff there wore rather strange uniforms.

" H-H-Heroes!" One of them stuttered when he lifted his head to see them. " Go alert someone!" He turned to one of his co-workers.

" Who? Lord Oyakata or the pillars?" Deku wondered what were these pillars, clearly they showed authority.

" We're here to see Oyakata." They glance at each other and nodded. One of them gestured the heroes to follow as she led them into the mansion. " Excuse me for asking but might I ask why you were such uniforms?" Night eye asked, they even covered their heads and mouths to make sure their face remained unrecognized.

" It's mostly a habit. It used to be a requirement for the job but it isn't my place to explain why." She led them to a living room and was surprised herself to see a young boy with dark hair and two girls with white hair by his side. " Oyakata-sama! I didn't know you were here!" She bowed in apology.

" It's alright, I'm merely resting with my sisters." The three siblings turned to the heroes and bowed. " Forgive me for not preparing for your visit." He turned to the staff with a gentle smile as he placed a few sheets of paper onto the floor boards. " Could you please fetch some tea for the guests?" The staff did as she was told and quickly left the room. " Can I help you?" He asked gently with a soft smile. Deku wondered how his voice could sound so soothing. Is it a quirk? His tone?

" Are you the current head of house here?" Bubble girl asked him with concern. He was far too young to lead a yakuza household.

" Yes, my father had passed away the previous year with my mother and two other siblings." He explained, his smile didn't falter.

" We are here to discuss a scheduled appointment with the head of house and your 'pillars'? Regarding the pact with this yakuza household and the heroes." Bubble girl explained.

" Is that so? My apologies we weren't aware of that. Kuina, please send the message for a pillar meeting, oh and Nezuko as well, she's helped us a lot." The boy said ever so gently to his sister. She turned to the garden and held out her hand, a large crow flew to her and waited patiently as she gave the bird the message. The bird seemed to nod and flew off. " I hope you don't mind waiting for a bit." He paused as a flower crown was placed on his head. " Hello, Nezuko." The girl that literally appeared out of nowhere smiled. " Are those for your brother and the others when they return?" Nezuko nodded happily. " Nezuko, say hello to our guests."

" Hello, guests." She said cheerfully and went to sit next to them. A knock on the door made her smile even brighter.

" Excuse me for interrupting." A boy with a checkered hoodie about Deku's age said as he opened the doors. " Nezuko, is this for me? It's great. My apologies Oyakata-sama, it looks like it'll just be me today. The others are preparing for the New years event and some are visiting the graves. I don't exactly have the heart to make them leave their places yet." He said as he bowed. Half of his face was wrapped in bandages and his red eye seem to radiate kindness. " Oh, I forgot to introduce myself. My name is Kamado Tanjiro and this is my sister, Nezuko. I'm the sun pillar, it's nice to meet you."

" So for this alliance, we need to show that we are mutually working together to the public, correct?" Oyakata-sama asked the heroes.

" That would be efficient in a way. It'll cause the villain rate to decrease in the long run." Night eye answered.

" Then I have an idea," Oyakata said as he looked at Tanjiro.

To which, led to UA having to accept four transfer students into their fold. They attend the hero classes and will be granted a student license when they take the next license exams. But for now, two of which are attending class 1-A despite being a year older.

" Tanjiro, I can't do this." Zenitsu stated as he shrunk back behind his friend. " Surrounded be heroes it's scary. Way too scary!" The blonde cried.

" I'm sorry, he's a bit scared around new people..." Tanjiro apologized to the class.

" Just shut up and sit down already!" Bakugo shouted and received a blank stare from the blonde.

" Oh hell no!" Zenitsu screamed. " One boar is enough!"

" Who the hell are you calling a boar!?" Bakugo grit his teeth.

" That's enough." Aizawa glared at the entire class. " If you could take your seats." The door broke down as a boy rammed right through.

" I made it...." The deep voice rumbled. " Monjiro! I wanna be in a class with you!"

" Get back here!" Blood King tried to grab him but he was quick to evade. " Quit making things difficult kid!"

" Like hell I'll join your stupid class. Everyone there is too weak!" Aizawa activated his quirk and threw his binds, which successfully captured the angry boy. " Do you really think this is enough to stop me?" He growled and was surprisingly right. Within a few seconds he was able to slip right out of the binds with ease. " Behold! Look what else I can do." He bended his body backwards and hugged his own ankles. Laughing menacingly he mocked the teachers. " Weak! Too weak! I've killed an upper moon! I'm way stronger!" Blood king grabbed him and attempted to drag the kid back to class. " Let me go! Gonpachiro! Fight me!"

" Inosuke, hold it. I understand if you're not able to attend a class. You just learnt how to read after all. I could ask Oyakata-sama to exclude you from the program if you want." Tanjiro said in a calm gentle voice.

" Are you saying I can't do it!?" Inosuke screamed. " I'll show you! I can do it! Hey, teach me stuff! Take me to class!" The sudden change was just startling but Blood King was just glad that he was now much more willing to cooperate.

" I'm very sorry. Please be patient with him. He was raised in a mountain by boars so he behaves rather differently." Tanjiro explained. " Inosuke, have fun learning!" Inosuke seem to go quiet for a moment before leaving in a huff. " Zenitsu, you're pretty amazing yourself, you've lived in a city before so you know a lot more things than me. Let's do our bast together." Zenitsu blushed as he received the praise and was able to get to his seat with ease. Aizawa figured that this was going to be a very long semester.