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Class 1A doesn't know that katsuki and izuku are brothers they just think that Katsuki hate izuku and that deku just put up with it, they also don't know that they have other siblings.

Karasuno and Nekoma did not expect For some of their teammates to be related to each other.

"Um deku-kun did you dye your hair?"

Go to my book "Ideas for story's" for details