Due to Bakugou's quirk and all the yelling he does, he is deaf.
Example
Bakugou: *gets to the dorms after school*
Bakugou: Kirishima...?
Kirishima: *waves*
Bakugou: Hold on let me get a notebook-
Kirishima: *grabs Bakugou's shoulders*
Kirishima *Sign Language* No need
Bakugou: *Sign Language* You know SL?
Kirishima: *Sign Language* Not I, We.
Bakugou: *sign Language* We?
Mina: *sign language* We!
Sero: *sign language* We!
Denki: *sign language* We!
Jiro: *sign language* We!
Bakugou: Y-you guys... *tears up*
**THIS WAS BASED OFF A TIK TOK**
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MHA Headcannons
Action- A little Kiribaku - Most of them aren't original - Bakusquad: Bakugou, Kirishima, Denki, Mina, Sero, and Jiro -Dekusquad: Deku, Todoroki, Iida, Yuga, Ochako, and Tsuyu - Enjoy!