My Hero Academia has seen a plethora of Quirks get introduced in the series over the years, and undoubtedly, the One For All remains to be one of the strongest, if not the strongest. The Quirk was first wielded by All For One's brother, who he passed it down to before dying. In time, the Quirk was wielded by All Might, who used its powers to become the Number 1 Hero in the world. Currently, One For All lies in possession of Izuku Midoriya.
With enough powers to match All For One, few Quirks can be deemed to have enough potential to match the phenomenal power that it packs. Here are 5 Quirks that can surpass One For All and 5 that can't.
10 Can: Half-Cold Half-Hot
Half-Cold Half-Hot is a Quirk that's wielded by Class 1-A's Shoto Todoroki. This Quirk enables Shoto to control both ice and fire at will with two sides of his body. Unlike Endeavor's Hellflame, Shoto can use his ice powers to regulate the temperature, and therefore, move past the limit that holds Endeavor back.
According to the current Number 1 Hero, Shoto Todoroki possesses enough potential to surpass All Might in terms of fighting capabilities, and that says a lot about how strong Half-Cold Half-Hot can get in the future.
9 Can't: Hardening
Hardening is a Quirk that's used by Eijiro Kirishima of U.A's Class 1-A. Using its powers, Kirishima can harden his body to extreme levels and hence, gains the ability to endure a high amount of damage. Using the Unbreakable mode, all his stats are amped further to the point where he is not only able to defend with great resilience but also attack with insane power as well.
Despite all this, Hardening isn't a Quirk that can realistically match the One For All, the power of which can vaporize things when used at 100% power.
8 Can: Explosion
Wielded by Bakugo Katsuki, this Quirk boasts extremely high offensive capabilities. Explosion allows Bakugo to produce nitroglycerin from his palms, which he can ignite to create massive explosions. Using its powers, Bakugo has been able to progress at a decent speed towards his goal of becoming the Number One Hero.
More or less, he has always progressed side-by-side with Midoriya Izuku, which is likely going to be the case right until the end of the series. In fact, when the two fought previously, Bakugo emerged as the winner, which indicates that his Explosion could possibly be slightly stronger than One For All.
7 Can't: Zero Gravity
Zero Gravity is the Quirk of Ochaco Uraraka, also known by the Hero name of Uravity. Using its powers, Ochaco can nullify gravity's effects on certain objects that she touches with her hands. To maintain the said effect, Ochaco had to take a particular stance.
Her control over the objects depends on various factors. Although this Quirk is very useful and can actually accomplish some things that the One For All can't, it isn't anywhere close to Izuku Midoriya's Quirk. Undeniably, the power difference between the two Quirks is considerable.
6 Can: Decay
Decay is a Quirk that is used by the current leader of the Paranormal Liberation Front, Shigaraki Tomura. Using its powers, Shigaraki can spread rot in things at a near-instantaneous pace, disintegrating them in the process. Although this Quirk wasn't as powerful in the earlier parts of the series, it has now grown to be one of the strongest Quirks around, particularly after the events at Deika City.
Shigaraki's re-awakening of this Quirk had easily made it one of the strongest that we've seen in the series to date and also given it the potential to surpass One For All.
5 Can't: Hellflame
Hellflame is the Quirk of the current Number 1 Hero, Endeavor. It goes without saying that this Quirk is very powerful, as it has helped Endeavor deal with some of the most vicious villains, such as the High-End Nomu. As of now, Hellflame is far more powerful than the level at which Midoriya can use the One For All.
However, when used at 100%, One For All is certainly stronger than Hellflame, as proved by All Might in the past. Furthermore, under Midoriya, a totally new aspect of One For All has surfaced, which gives him the power to use seven more Quirks in total, making it even stronger than before.
4 Can: Overhaul
Kai Chisaki is the user of the Overhaul Quirk, which interestingly enough, is also his villain name. Using this Quirk, Chisaki can deconstruct and reconstruct matter at will, which makes it a very powerful Quirk. Just a single touch from Overhaul is lethal, as seen during the Shie Hassaikai arc.
While One For All is very powerful in its own right, it certainly isn't as dangerous as Overhaul. Unfortunately for him, Chisaki lost the ability to use this Quirk after clashing with Shigaraki Tomura after the Shie Hassaikai arc.
3 Can't: Gecko
Gecko is wielded by Shuichi Iguchi, also known by the name of Spinner. This Quirk might just be the weakest one that we've seen in My Hero Academia so far, as it does the bare minimum that a Quirk could possibly do. Along with making him look like a lizard/gecko, this Quirk gives him the skill to stick to things, which is the extent of his abilities.
There may be an aspect of this Quirk that we haven't seen so far, but that's likely not going to be groundbreaking at all. As such, it is evident that Spinner's Quirk is never going to get even remotely close to One For All in the series.
2 Can: Permeation
Permeation is the Quirk of Mirio Togata, one of the U.A. Big Three. This Quirk lets his body phase through things, although there are certain disadvantages to it, such as Mirio losing all his basic senses when using it. While the Quirk isn't strong itself, the way Mirio uses it makes it an incredible Quirk. In fact, his usage of this ability is such that he was considered to be the man closest to All Might even among the Pro Heroes.
Mirio lost his Quirk towards the end of the Shie Hassaikai arc, but it can possibly return to him in the future, giving him the chance to work at it again and possibly surpass One For All in the process.
1 Can't: Steel
Steel is the Quirk belonging Class 1-B's Tetsutetsu. Just like Eijiro Kirishima's Quirk, it gives him the ability to harden his body, although in his case, the said hardening is achieved by turning the body into steel. As noticed in the Joint Training arc, his Quirk also gives him a level of tolerance to heat.
Strong as this Quirk is, it is nowhere near the level of Eijiro Kirishima's Hardening, let alone Izuku Midoriya's One For All. That's not to say that this Quirk is weak. It has enough power to make Tetsutetsu into a decent Hero, but certainly not enough to make him one of the Top 3.