Some Quirks reshape battlefields. Bullhorn simply makes its owner impossible to ignore. Belonging to an unnamed admirer of All Might, it turns an ordinary voice into something that carries, and little else about it has ever been spelled out.
Bullhorn, written in Japanese as メガホン and read as Megahon, belongs to a fan of All Might whose name is never given. The ability surfaces in Chapter 0 of My Hero Academia: Team-Up Missions, and that appearance remains the only real window into how it works.
Classification places it among Emitter Quirks with a long operating range, which fits a power whose entire output travels through the air.
Documentation is thin. What the material shows is straightforward amplification: the user speaks and the sound arrives far louder than a person could manage unaided. No secondary effects, limits, or drawbacks have been established.
The concept overlaps noticeably with Voice, another Quirk built around vocal output, though the two are treated as separate abilities.

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Bullhorn is a Quirk belonging to an unnamed fan of All Might, appearing in the My Hero Academia: Team-Up Missions spinoff. It is an Emitter type Quirk with long range.
Bullhorn amplifies its user's voice so it carries far louder than a person could manage unaided, though no other effects have been shown.
The only known user of Bullhorn is an unnamed All Might fan who appears in the Team-Up Missions spin off. No other character has been shown with the ability.
Bullhorn debuted in Chapter 0 of My Hero Academia: Team-Up Missions.
Bullhorn overlaps closely with Voice, another Quirk built around vocal output, though the two are treated as separate abilities in the series.
Looking for more on Bullhorn? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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