Give me Unique Quirk ideas!!!

I want to think about new, Unique Quirks! Side effects, draw backs, power ups, all the juicy quirky concoctions! Basically what's a detailed Quirk that you thought up!! I'll go first

Schrodinger

Everything about the user is completely uncertain. They are neither alive or dead, boy or girl, warm or cold, loving or hating. The less an opponent knows about the user, the stronger they are. The same goes for the user. The less they can identify about themselves, the stronger they can be. It does mean their strength is dependant on others knowledge though.

Once the user is no longer on the forefront of a person's mind, they start to forget what they knew about them. It is possible to completely forget about them over a period of time. Thanks to this, quirks like Ragdolls search don't work very well on the user. It also isn't possible for the quirk to be stolen, as it both does and does not exist untill the user confirms it.

Not the most well thought out Quirk idea, but it would be an interesting, not to mention lonley one.