Akira's Quirk is only ever seen under the effects of the drug Trigger. However, it is stated to be an exceedingly complex Quirk.
This Quirk gives Akira a hardened body, similar to the Quirk Hardening. However, this Quirk also has multiple more adaptations to it, giving the user a number of rocks growing from atop his head, neck, and shoulders. Additionally, the Quirk also gives its user Gigantification, to a certain degree, making the user larger. It also gives them increased strength, able to punch holes into concrete, and in the ground.
This Quirk is shown to be very powerful; however, it has a number of weaknesses. For example, because the user has to consciously activate the Quirk, if their concentration is broken, they can easily drop their Quirk's effects and become vulnerable. Additionally, the eyes of this Quirk do not get hardened at all, leaving them vulnerable to attacks.
What the Quirk is like without being affected by Trigger is unknown.