Delete is a quirk which let user delete anything particuler with in the range of his sense . This quirk posses technical ability as well as reality warping but it requires extream practice to get use of reality warping ability. Person can delete anything with this quirk weather it's opponents quirk or simple computer file. Though it requires practice it can also be use for rescue operation to remove large debris, with enough practice one can even delete effect of other quirk or impact from physical hit. Though it require precise control person can also use this quirk medically to delete negative effect on person body due certain injury or illness. It have varity of application depending on user creativity .
Anyone one can use ability mention in my above in there fanfiction.