Just saw a picture of Toshinori in his full-body swimsuit and an idea hit me:
Headcanon that Toshinori goes to the beach with his students at one point. It’s not his idea, obviously – even after he’s true form is revealed, he has that habit to keep to himself (children and colleagues excluded) and doesn’t go out very often. But the children don’t want to hear any of it - it’s summer, and hot, and hot summers call for a beach day.
So the students plead and beg and use those big round puppy-eyes (Mina’s speciality, really) until Toshinori relents and agrees to accompany them.
The children are beside themselves with joy, and run off immediately to prepare swimsuits and a picknick and everything else they will need.
It’s only when they arrive at the beach and change into their suits that Toshinori realizes that he’s the only guy who doesn’t wear swimming trunks but a full-body suit. He hesitates, looking down at himself. He’s probably pretty old-fashioned in this. Perhaps the kids will even think that he looks silly. But even if he had swimming trunks that he could wear – he wouldn’t do it. Not with the large, ugly scar in his side.
So he swallows thickly and decides to just grit his teeth and get to it.
He’s still a bit hunched over and insecure when he steps outside and goes to join the others.
But the reactions are far better than he anticipated – and really, it shouldn’t surprise him so much. He has some wonderful students.
Izuku doesn’t even bat an eye at the sight of the swimsuit, already used to it from their training together, probably. But he does notice that Toshinori looks a bit tense, and is instantly at his side to ask quietly, “Toshinori-san, is everything alright?”
“Don’t worry, my boy,” Toshinori smiles weakly and ruffles the boy’s hair. “Just me being weird again.”
“You’re not weird..”
“Sensei!” Yaoyorozu interrupts, waving over from where she is helping the others to set up a sunshade and a towel to sit on. “Over here! We prepared a shaded place for you, since it’s quite hot already.”
“Ah, thank you…”
“Oooh,” suddenly, Tooru is there at his side, tugging at the loose material of the swimsuit over his rips and making Toshinori jump in shock. “Sensei, that swimsuit looks really cute on you!”
“Uh,” Toshinori blinks down at her, unsure if he should be flattered. “Cute” is not often used to describe All Might… or him, for that matter. “Okay?”
“A sunhat would match!” Uraraka observes. Without much hesitation, she pulls her own hat off and puts it onto Toshinori’s head.
After a short scrutiny, the group of children exchanges a few looks – making Toshinori a bit nervous as to what they think – and Kirishima declares, “Now you’re prepared for a beach day, Sensei!”
Toshinori can’t help it – he grins at the enthusiastic children who beam expectantly at him. “Thank you, everyone.”
“Oh, hey, can we go swimming now?”
“Yeah, let’s go!”
“Sensei, are you coming, too?”
“I will just observe, for the moment.”
The children push and pull him under the sunshade and onto the towel (“Make yourself comfortable, Sensei!”) and make sure that he has everything he needs – from sunscreen to drinks and food. Even some books, should he get bored.
As if he could get bored when his students are right there with him.
Later, Toshinori couldn’t care less if he looks old-fashioned or silly or anything. He is as content as one can get, lazing around, sipping some water, and watching his kids play in the water. From time to time, he waves, grinning, over at someone who had just called for him.
It’s their first beach day, but somehow, they silently agree to repeat this as soon as possible.