Izuku Midoriya, more commonly known as Deku, is a beloved character from the popular anime and manga series, My Hero Academia. As the main protagonist, he possesses an incredible quirk known as One For All, which allows him to stockpile power and transfer it to others. Despite being a powerful quirk, some fans speculate that Deku may have additional quirks that will manifest in the future. While some of these theories have been debunked, there are still some that have yet to be confirmed or denied.

One of the most popular fan theories is the existence of Blackwhip, a quirk possessed by one of the previous users of One For All, Daigoro Banjo. In the anime and manga series, it is shown that Deku briefly manifests this quirk during a fight with a villain, Gentle Criminal. However, it was explained that this was due to a connection with Banjo’s spirit rather than a natural manifestation of the quirk in Deku’s body. While it is possible that Deku could learn to fully control Blackwhip in the future, it is not considered one of his inherent quirks.
Another fan theory suggests the possibility of Deku manifesting the quirk Float, which is possessed by another previous user of One For All, Nana Shimura. The quirk allows the user to levitate and fly. Although Deku has not exhibited any signs of possessing this quirk in the series, it has been hinted that it may manifest in the future due to his connection with Nana’s spirit. It is possible that this could be one of the additional quirks that Deku develops as he gains more control over One For All.
There is also a theory that Deku possesses a quirk called Danger Sense. In a fight against the villain Overhaul, Deku exhibited the ability to sense danger and predict incoming attacks. However, it was explained that this was a result of Deku’s heightened instincts and intuition, rather than a separate quirk. Therefore, it is not considered one of his inherent quirks.
Another theory is that Deku has a quirk that allows him to withstand extreme temperatures. In the anime and manga series, Deku has been shown to survive being engulfed in flames and to resist the effects of a scorching hot sauna. However, it has not been confirmed whether this is due to a separate quirk or simply a result of his physical endurance and training.
Super strength is another quirk that has been speculated to exist in Deku. Despite possessing incredible physical strength even without using One For All, it has been explained that this is simply a result of his intense training regimen and the development of his natural abilities. Therefore, it is not considered a separate quirk.
Lastly, there is a theory that Deku has the ability to heal from injuries at an accelerated rate. In the series, he has been shown to recover from broken bones and other injuries much faster than normal humans. However, it is unclear whether this is due to a separate quirk or simply a result of his physical endurance and training.
In conclusion, while Deku only possesses the quirk One For All, there have been various fan theories about additional quirks that may manifest in him. Some of these theories, such as Blackwhip, have been partially confirmed in the series. Others, such as Float, have yet to be seen but are hinted at in the story. However, some of the speculated quirks, like super strength and enhanced healing, are likely a result of his intense training and natural abilities. It remains to be seen whether any additional quirks will manifest in Deku as the series progresses, but fans will undoubtedly continue to speculate and theorize.