The Todoroki siblings learned morse code to talk to eachother. Even after Touya 'died', they still used it. Even when they're alone they start subconsciously tapping in morse code. The League of Villains and Class 1-A put it down as a nervous tick their resident fire users have
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BNHA Headcanons
De TodoThis is just a bunch of my My Hero Academia Headcanons. There will be a lot. No update schedule. I might just publish this all at once and add on as I come up with more headcanons