My Hero Academia, the story of a group of teenagers who are all studying to become Pro Heroes, has become extremely popular in recent years. Most humans in My Hero Academia possess some type of power called a Quirk, and some folks use their abilities for heinous reasons.
All For One is the series' main antagonist, and as far as villain Quirks are concerned, he possesses one of the strongest. His Quirk allows him to steal other people's powers, and he can store them inside his body. He can then use them as if they were his own. All For One has stolen a lot of Quirks over the decades, and there are a number of Hero Quirks that the villain would love to add to his collection.
10 Shota Aizawa's Erasure Quirk
Shota Aizawa is a well-known and respected Pro Hero who uses a specialized cloth while fighting villains, but this item is only effective because of his Quirk. Erasure is one of the strongest Hero Quirks in MHA, and that is because it gives Aizawa the ability to nullify another person's Quirk.
The only real issue is that Aizawa needs to be looking at his target in order for the Quirk to activate, which explains why it deactivates when he blinks. All For One would love to have this ability because it would allow him to stop anyone using One For All against him.
9 Mirio Togata's Permeation Quirk
At one point, Mirio was the top candidate to become All Might's successor since he possesses a keen intellect and an unbreakable will. His Permeation Quirk would have worked well with One For All's physical aspects.
The Quirk allows Mirio to become intangible, which means that he can pass through solid matter. When done correctly, he can unleash a flurry of almost instantaneous attacks. It also allows enemy attacks to safely pass through his body. If All For One had this Quirk when he fought All Might, their final battle would have ended very differently.
8 Thirteen's Black Hole Quirk
Season 1 contains one of My Hero Academia's best episodes, and it is also the only core that features Thirteen's Quirk in action. The Quirk is called Black Hole, and it essentially gives her fingertips the ability to mimic the suction effects of a black hole.
Thirteen uses this Quirk for search and rescue operations, but if a villain like All For One were to get his hands on it, he would be able to cause serious damage. Anything that gets sucked into the user's fingertips gets disintegrated, and the suction effect is so powerful that even light cannot escape it.
7 Nemuri Kayama's Somnambulist Quirk
Nemuri Kayama is a teacher at U.A. High School, but she is also known as the R-Rated Hero: Midnight. Her Hero persona is dominatrix themed, and her Somnambulist Quirk gives her the ability to release a unique smell from her body.
This smell allows Midnight to put anyone nearby to sleep, but it tends to be more effective on men. This may not be a flashy Quirk, but All For One would certainly be able to see the value of a Quirk that can put male Pro Heroes to sleep.
6 Toru Hagakure's Invisibility Quirk
Class 1-A is filled with aspiring Heroes, and most of them have specialized Quirks, but Toru's ability is pretty straightforward. Her Quirk is called Invisibility, and as the name suggests, it makes her entire body invisible. Later on in the series, Toru develops the ability to temporarily blind her opponents by warping sunlight with her body.
This Quirk is literally a villain's dream because it would allow them to steal or potentially eliminate someone without being detected. All For One would not want Invisibility for petty robberies though, he would want it because it is the perfect Quirk for spying and executing sneak attacks.
5 Momo Yaoyorozu's Creation Quirk
Momo may not be the strongest member of Class 1-A, but she has the qualities of a natural leader. She possesses a genius-level intellect, which is great because her Quirk can only be used by someone who understands molecular structures.
Creation allows Momo to transform her fat cells into any non-living object or material. She can use this Quirk to create weapons or a number of defensive objects, but she needs to eat in order to maintain her body fat. With this Quirk, All For One could create a functional gun at any time, or he could make himself some armor to defend against Hero attacks.
4 Best Jeanist's Fiber Master Quirk
Best Jeanist is the current No.3 Hero and he usually stops villains by restraining them. His Fiber Master Quirk is fairly unique, as it gives him the ability to manipulate the threads of any nearby fabric. This power does not work well on sweats, but it is especially effective on denim.
All For One saw this Quirk with his own eyes when Jeanist used it to temporarily restrain him. If All For One were to steal it from him, he would be able to capture a Hero by using their own clothes against them. This would make stealing Quirks a lot easier.
3 Shoto Todoroki's Half-Hot Half-Cold Quirk
There are quite a few characters who possess more than one Quirk, but Shoto is not one of them. His Half-Hot Half-Cold Quirk allows him to create flames on the left side of his body, while his right side is capable of generating ice. He can use the fire and ice separately, but he can dual-wield them as well.
If All For One were to see this Quirk in action, he would jump at the chance to steal it because of its incredible offensive potential. At full power, the flames can burn someone to ash, while the ice can be used to completely immobilize an opponent.
2 Izuku Midoriya's One For All Quirk
Izuku Midoriya was born without a Quirk, but that did not stop All Might from making him his successor. One For All is the Quirk All Might gave to him, and it is a transferable power that gives the user superhuman strength, speed, durability, stamina, and reflexes.
Izuku is arguably One For All's best user, and that is because he has learned to use a number of the previous user's Quirks as well. He can now create tendrils and smokescreens, but he can also float and sense danger. Of all the Quirks on this list, One For All is the only one that All For One has tried to steal, and he attempted to do it twice.
1 Hitoshi Shinso's Brainwashing Quirk
Every single U.A. student has managed to improve significantly, but some have improved more than others, Hitoshi Shinso has improved a lot, and he wishes to become a Pro Hero despite the fact that he possesses a Quirk that causes people to fear him.
The Quirk is called Brainwashing, and it forces people to obey Shinso's commands. This power can only activate if someone verbally responds to him, and he can control multiple people at once. If All For One had this ability, he could control the movements of any Pro Hero who comes after him, and if he wanted to, he could use it to destroy society in a number of ways.