Hair turned rigid on command. Bristle belongs to Tsuyoshi, a Transformation Quirk from the Team-Up Missions spinoff that hardens its owner's hair dramatically. Beyond that single description the ability remains almost entirely unexplored, since Tsuyoshi has never been shown putting it to work.
Bristle, written in Japanese as Gōmō, is the Quirk belonging to Tsuyoshi. It carries a Transformation classification and a close-range designation.
The power comes from My Hero Academia: Team-Up Missions, debuting in Chapter 3.2 of that spinoff. Wiki categories list it under Quirks and Team-Up Missions Original Quirks.
The recorded effect is a single line: the user's hair can be hardened to a considerable degree.
Everything past that is blank. Tsuyoshi has never been depicted using the ability in any situation, so its range of application, its limits, and its practical strength all remain unknown.

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Bristle is a Quirk belonging to Tsuyoshi, a character from the My Hero Academia: Team-Up Missions spinoff. It is a Transformation type Quirk that works at close range.
Bristle allows Tsuyoshi to harden his hair to a considerable degree, though the story has never shown him actually using the ability.
Bristle debuted in Chapter 3.2 of My Hero Academia: Team-Up Missions and has not yet appeared in the anime.
Tsuyoshi is the only character shown with the Bristle Quirk.
The closest comparison in the franchise is the unnamed hardening Quirk carried by Crimson Riot, which works along similar lines to Bristle.
Looking for more on Bristle? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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