Muscle Augmentation is a Quirk that gives its user the ability to amplify, and to a degree, manipulate their muscles, granting a significant increase in strength, speed, and durability. When using this Quirk, muscle fibers can be enlarged to the point where they can no longer be contained by the user's skin.
While powerful, the brute force granted by this power can be bested by One For All users going beyond their 100% output. Another weakness of the Quirk is that in between the muscle fibers, the strands depleted of energy tend to rip and tear away.
All For One gave Wolfram the ability to enlarge his muscles and greatly increase his strength. When activated, Wolfram's muscles don't protrude from his skin, instead, they glow bright red, altering his appearance as a result. This is similar to how One For All at 100% changes the appearances of All Might and Izuku.
Combined with the Quirk Amplification Device, this Quirk gave Wolfram enough raw strength to momentarily overwhelm All Might and turn the tide of their battle. Using this ability, Wolfram was able to injure All Might and compensate for his weakness at close range when manipulating metal.
Hood mainly uses enhanced muscle fibers to support his other Quirks, giving him incredible destructive power. Hood can cover his arms and muscles, transform them into powerful tendrils, and increase their power even more by using it in tandem with another strength enhancement Quirk.
- Muscle Augmentation's Japanese name, "Kin'niku Zōkyō" (
筋 肉 増 強), is the same as Pump Up's.
- The function of Muscle Augmentation is identical to Muscle Expansion and Pump Up.