Doctor Strange in The Multiverse o Madness - The Loop
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Bristle allows the user to make their hair super hard.
Tsuyoshi has not been seen using it under any circumstances, so more characteristics of the Quirk are unknown.
- This Quirk shares similarities to the unnamed hardening Quirk possessed by Crimson Riot.
- My Hero Academia: Team-Up Missions Manga: Chapter 3.2.