Blade is an unnamed Quirk that is used by an unnamed Villain.
When under the effect of Trigger, the blades are able to reach extreme lengths, and are able to inflict damage onto Eijiro through his Quirk. These effects are temporary, however.
The Quirk also appears to be able to be focused in one place, which can help to cause devastating amounts of damage. It can also be used to launch the user through further distances.