Flash Bang Sweat is the conjecturally named Emitter Quirk belonging to Dadan Tadan, an anime-original ability from Training of the Dead. His perspiration detonates into blinding light and a deafening report on contact, and his costume packs the stuff into missiles for wide salvos.
Dadan Tadan of Isami Academy High School carries this unnamed Emitter Quirk, labeled Flash Bang Sweat for lack of an official title. It appears only in the anime-original story Training of the Dead, placing it outside the main canon.
What the Quirk produces is sweat, though not the ordinary kind. The secretion reacts the moment it strikes something, throwing off a burst of harsh light paired with a loud crack. Whether the ability explains why Dadan perspires constantly has never been settled.
By itself the effect is purely disruptive. Romero Fujimi remarked that it would be a better weapon if the bursts could actually injure someone.

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Dadan Tadan is the sole user. His hero costume loads the substance into missiles, letting him blanket a broad stretch of ground in a single volley whose noise carries well past the point of impact. The reliance on sweat as fuel invites comparison with Katsuki Bakugo's Explosion, which runs on the same principle to very different ends.
Flash Bang Sweat is an unnamed Emitter Quirk belonging to Dadan Tadan that produces sweat which bursts into blinding light and a loud crack on contact.
Dadan Tadan of Isami Academy High School is the sole known user of Flash Bang Sweat.
Flash Bang Sweat appears only in the anime-original story Training of the Dead, which makes it a non-canon Quirk.
No, Flash Bang Sweat is purely disruptive rather than harmful. Romero Fujimi noted it would be a better weapon if its bursts could actually injure someone.
Flash Bang Sweat draws on the same principle as Katsuki Bakugo's Explosion Quirk, since both rely on the user's sweat as fuel, though they produce very different effects.
Looking for more on Flash Bang Sweat? The My Hero Academia Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the My Hero Academia anime series, manga, and official materials. My Hero Academia was created by Kohei Horikoshi, published by Shueisha, and animated by Bones. All rights to My Hero Academia and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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