Permeation

Permeation is a Quirk used by Mirio Toogata.

Description
Through his Quirk, Mirio is able to phase through anything solid or liquid, including the ground itself, allowing him to travel through walls and avoid enemy attacks.

Mirio is able to restrict the effects of his Quirk to individual body parts. To pass through a wall or object, he has to follow a set of specific steps in order to do it successfully. While fully permeated, everything passes through Mirio's body, including air, light and sound, effectively leaving him temporarily blind and deaf, as well as breathless. However, he still possesses mass, meaning he's affected by gravity and will fall down when using his Quirk above the ground. His clothes also fall off when his Quirk is activated.

Mirio's Quirk also features a peculiar property; whenever he deactivates his Quirk while inside a large solid mass such as the underground, his body instantly gets catapulted out due to the mass of Mirio's body being unable to overlap with any other preexisting mass, giving off the illusion that he's teleporting after descending into the ground. Thanks to rigorous training, Mirio was able to master transportation through this application, being able to adjust the direction and positioning of his falling body in order to control the trajectory of his catapulting as well as using experience-based prediction in order to show up next to targets.