MHA quirk ideas

All for one

Description: All For One allows the user to steal the Quirks of other people and wield those stolen powers as their own. It also allows the user to redistribute stolen Quirks to someone else. The process of giving and taking away Quirks is done through touch. A victim whose Quirk has been stolen becomes Quirkless, and loses any abnormal features if the powers happened to be Mutant-types. Interestingly, even if the user holds Mutant-type Quirks, the subsequent features do not permanently manifest on the user's body, and they can instead summon the mutant features at will. Additionally, when a Quirk is stolen, the victim becomes disoriented and immobile for a short time. Meanwhile, Quirkless people who receive a Quirk through All For One become capable of manifesting all of its attributes.
Rarely, a Quirk granted by this ability can blend together with the recipient's original Quirk, creating an entirely new power, as shown with One For All. All For One can be used to combine several Quirks in order to create devastating techniques, which would normally not be possible with the usage of only one Quirk. All For One's first user intended to have Tomura inherit his Quirk, implying that transferring All For One itself to another person is possible. This was evinced to have already been accomplished, as All For One, prior to being sent to Tartarus, had Doctor Kyudai Garaki extract his power from his body, and duplicated, with the original being kept on standby to be passed on to Tomura, while the Symbol of Evil retains the copied version of his original Quirk. It has been shown that the recipient of the All For One Quirk itself can access the Quirks that the previous user possessed due to the said powers becoming applications of All For One, rather than extra Quirks. Another facet of receiving this power is having a mental link with the previous user, whose psyche was imprinted onto the All For One Quirk. As a result, Tomura exhibits some of his master's personality traits, and can meet with a vision of All For One within his own mind. This is similar to how the wills of the One For All users are integrated into One For All itself, which has evolved to where Izuku Midoriya can loosely communicate with the previous inheritors of the said power. It was soon revealed that both cases are due to the common spectacle that Quirks, much like organs during organ transplants, retain the consciousness of their donor, whose power was granted to the recipient. All For One seems to grant access to an unidentified mental realm contained within the Quirk similar to its counterpart Quirk, One For All, as shown when Tomura tried to steal One For All from Izuku. When this happened, the mental realms of both Quirks became connected temporarily and the current users, and the stored consciousness of previous users, were shown inhabiting the same mental realm.

Usage: The man who wields All For One once used his Quirk to dominate Japanese society over a century ago, using his Quirk to take away unwanted Quirks and give them to those who needed them, in exchange for favors. Eventually, All For One's user would amass a large following of loyal subordinates that carried out every single one of his wishes.
Later, this man would use All For One to empower genetically engineered creatures known as "Nomu" in order to assist Tomura and the League of Villains with the achievement of their goals. Even after his arrest, however, Nomus with access to various Quirks are still being produced, and his role in this scheme, assuming he has any, is not yet known at the moment. The Nomus' creator, Kyudai Garaki, explained that artificially transplanting Quirks, most of which he was able to replicate, into a person's body requires complex surgery and takes at least 3 months to fully integrate into the chassis, but it's more difficult without All For One.[17] This vindication postulates that All For One's ability to transfer Quirks onto people made the Nomu production process much easier. For combat, All For One's user prefers to combine many of the Quirks he has collected throughout his life in order to maximize their power and effectiveness, often to truly catastrophic levels. Since this man has no qualms with killing, he doesn't hold back in fights, and will even target defenseless people, using them as a distraction to his advantage.
It's been suggested by All Might that All For One was used to obtain a Quirk that grants agelessness, explaining how its user is still alive to this day. This would later be confirmed by Kyudai who replicated his own Life Force Quirk, and gave a copy to All For One.