Repurposing this because Cece's tag made me wonder: I don't remember if it was ever touched on, but did Toshinori choose his appearance as All Might, or is it just how the Quirk reacted to his desires/sense of justice?
Because Deku doesn't change appearance at all when he activates the Quirk, but there's a big contrast between Toshinori and All Might- and he takes advantage of that to keep his identities separate
some of toshinori's appearance without ofa is because of his injury too. when he was a kid in some flashbacks he looked fairly normal. it could be that ofa was keeping him bulked up as he would have been normally