Y/N was born quirkless like Izuku and they became best friends. They spent so much time together and they soon became "brothers". When they found out they were quirkless they promised each other they would still be heroes. No Matter WHAT! Y/N commit...
Present - 5-year-old Y/N was playing at a park, but soon heard a scream and saw a green haired boy in front of three boys who were bullying a him because of he had no quirk.
Young Izuku: [Crying] That's mean, Kacchan. Can't you see I'm hurt and crying? If you keep going, I-I-I'll never forgive you!
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Young Katsuki: Hmph. You wanna pretend to be a hero. You don't stand a chance without a Quirk. Deku. Y/N: (Runs Up) Hey leave him alone! (They all turn and see a young Y/N)
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Young Katsuki: Well, if it isn't another weakling.
Young Y/N: Just leave him alone or else. You'll be sorry. (Puts fist up)
The three start laughing, but Y/N had enough, so he rushed forward and punched Young Katsuki so hard that he flew back and hit another one of his friends-
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Young Katsuki got up and saw Y/N cracking his knuckles. Katsuki grew an angry frown but ultimately got and started to walk away with his friends-
Young Katsuki: This isn't over you quirkless loser.
Y/N: (Walks to Izuku and holds out hand) You okay?
Izuku: Yeah. (Takes it and gets up)
Y/N: Why were those jerks bullying you?
Izuku: Because I don't have a quirk yet. (Starts to tear up) I'm sure you don't want to friends with me. (About to walk away, but Y/N puts hand on shoulder)
Y/N: I want to be friends with you! And don't worry about not having a quirk because I don't have one yet either!
Izuku looks at him surprised before smiling back. Soon, they became best friends playing together, doing homework, and partnering up in school. Now, they're at Izuku's house having a sleepover and playing-
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Y/N: I got you this time Izuku!
Izuku: Oh, man.
Y/N: Annnnd back-flip kick!
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Y/N: Yes! (High-fives Izuku) Good game man.
Izuku: Hey. Y/N we're friends right?
Y/N: Of course. Why, what's wrong?
Izuku: It's just I wish we could be more than friends. That, we could be.....
Y/N: Brothers.
Izuku: Yeah
Y/N thinks for a moment and than has an idea-
Y/N: Wait, I have an idea. Stay here. (Runs to kitchen and comes back with knife)
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Izuku: Why do you have a knife?
Y/N: I heard that if you truly want to become brothers with someone that you exchange blood. Are you ready?
Izuku: (Looks down and looks up determined) Yes.
Y/N: (Pokes hole in hand and hand knife to Izuku who does the same)
Y/N/Izuku: (Puts handshakes) Now we are The No Quirk Brothers! (They hug each each other while the mothers were watching gushing over the cuteness)
