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Doctor Strange in The Multiverse o Madness - The Loop
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Muscle Expansion (?)[1] is the Quirk used by Hard Head.
Description
Muscle Expansion allows the user to expand and strengthen their muscles, granting them a significant increase in physical strength.
Trivia
- This Quirk functions identically to Muscle Augmentation and Pump Up.
- The abilities of this Quirk are never shown in neither the manga nor in the anime, only in My Hero Academia: The Strongest Hero.