I think Aoyama got his quirk from All For One.

She grinned, "That sounds like amazing advertising…!"

... "A Quirkless Hero using high-tech to fight Villains…?" [ID: Aoyama from the quirk assessment test in S1E5 with the subtitle “If I shoot for more than a second, I get a stomachache.”] Izuku Midoriya has a Quirk: he has a paw-shaped birtmark on his hand that allows him to empower girls and transform them into magical girls briefly. Let’s start with the evidence that he is/was quirkless. The thing is, Aoyama knows he's quirkless, and that (in his view) he's faking being a hero amidst all his super-powered classmates. Tied in, obviously, with the theory that Aoyama is quirkless and even more so with this theory, is the possibility that Aoyama is the mole. Aoyama’s condition had to be exceptional to get that belt. Midoriya Izuku has been bullied his whole life for being quirkless. Quirkless Aoyama Yuuga; Quirkless Intelli Saiko; They all get Quirks thanks to Midoriya; Midoriya is essentially a walking zoo; Summary. So far, all of this is decent evidence that Aoyama may be secretly quirkless, but then what explains the stomachaches? My Hero Academia is moving into a new arc, and fans are ready to see how the heroes in Class 1-A will fare. Follow/Fav Deku the quirkless villain. Due to this global excess of powerful quirks, a superhero and supervillain society begins to emerge. Midoriya blows apart the room and AOYAMA is the one who hears it, wakes up, and comes to investigate, drawing an association between the two once again.

Aoyama has consistently, constantly made a point about the fact that he “stands out,” that he’s “special.” He acts arrogantly and dresses flashily to make up …

Quirkless Aoyama Yuuga; Quirkless Intelli Saiko; They all get Quirks thanks to Midoriya; Midoriya is essentially a walking zoo; Summary. And at the advice of his former bestfriend decides to end it all. First, the flashback from “RUSH!”. However what happens when a shattered boy gets pieced back together by the wrong crowd. Aoyama’s condition had to be exceptional to get that belt. So long as Aoyama can do heroic things, there's no reason for UA to expel him. Aoyama reintroduced himself by asking Midoriya if he remembered him before answering the question himself with an, "Of course, you do!" By: Io of nine. So far, all of this is decent evidence that Aoyama may be secretly quirkless, but then what explains the stomachaches? Izuku Midoriya has a Quirk: he has a paw-shaped birtmark on his hand that allows him to empower girls and transform them into magical girls briefly. She stepped towards him, pulling out blueprints, "Midoriya!"

The story of My Hero Academia takes place in a world in which quirks, or superpowers, are possessed by around 80% of the global population. [ID: Aoyama from the quirk assessment test in S1E5 with the subtitle “If I shoot for more than a second, I get a stomachache.”]