This page lists all the background Quirks used by unnamed characters found in the My Hero Academia series.
Note that most of the Quirk names here are speculative, based solely on their apparent effects.
Barrier is an unnamed Quirked used by an unnamed character. The Quirk creates a large, sphere shaped, transparent barrier around its user, which is large enough to encapsulate them entirely. It is assumed to be strong enough to protect it's user from a variety of external threats, making it defensive in nature. It is possible that it activates on reflex, as the woman was shown to be surprised by the Sludge Villain, and her Quirk activated without any obvious signs of her choosing to do so.
Camouflage is a Quirk that was used by an unnamed Villain in the USJ. The Quirk gave the Villain the ability to blend into their surroundings, and appear to be invisible against the inside of a building within the USJ. It also gave its user the appearance of a chameleon, though this may not be directly related to the Quirk. It does not mask sound however, as Katsuki was easily capable of detecting this Villain and defeating them in spite of their Quirk.
Demon is an unnamed Quirked used by an unnamed character. The character appeared alongside Katsuki and bullied Izuku alongside him.
This Quirk gives its user a set of large demonic looking wings which are red in color that are capable of granting its user flight. Because they are capable of doing so with a larger person, they are implied to be very strong wings. They can also be folded in to reduce the space.
Digit Extension is an unnamed Quirk that is used by an unnamed middle school student
This Quirk allows it's user to extend their digits, such as fingers and thumbs, to varying distances. Little else is known about the Quirk.
Eye Pop is an unnamed Quirk used by an unnamed middle school student
Eye Pop appears to be a Quirk that allows its user to pull their eyes out of their skull. They appear to be attached by their optical nerves. It is unknown how far they can be stretched.
Hand Spike is an unnamed Quirk used by an unnamed middle school student.
This Quirk allows its user to generate a number of spikes from their hands. It appears to work when the user had their hand in a fist, and the number of spikes do not seem to be restricted. No other information is known about this Quirk, as it was only briefly seen.
Levitation is an unnamed Quirk that is used by an unnamed middle school student.
This Quirk appears to allow its user to cause objects to levitate.It is unknown exactly how this Quirk worked. the only time it was used, the user was seen making a peculiar hand gesture, which implies that it may require certain actions in order to activate the Quirk. It is also unknown exactly what the limitations of this Quirk are.
Rock Skin is an unnamed Quirk used by an unnamed middle school student.
This Quirk allows it's user to turn their skin into rocks, which could presumably be used for both offensive and defensive purposes. The Quirk seemed to be permanently activated on the top of the head, but could be activated on various other parts of the skin, such as the hands, at the users will.
Sharp Tooth is an unnamed Quirk that is used by an unnamed middle school student.
This Quirk seemed to allow the user to manipulate their teeth from being standard to large, sharp teeth, like a canines. Nothing else is known about the Quirk.
Swelling is an unnamed Quirk that is used by an unnamed middle school student.
This Quirk seemed to allow the user to swell up their cheeks and neck. doing so makes the user's face turn red. Nothing else is known about the Quirk.