Warning! Spoilers ahead for My Hero Academia chapter 352!
A particular way in which Shoto Todoroki wields a variation of his Flashfire Fist super move is clearly the most creative of its kind in all of My Hero Academia. Flashfire Fist was originally developed by Shoto's father, Endeavor, as a devastating flame attack.
Although quirks serve as the foundation of My Hero Academia's battle system, alone they are usually quite plain. Super moves are methodologies that heroes and villains can tap into, altering the way in which they use or summon their quirk to achieve different outcomes. Although quite flashy and visually stimulating, Shoto's quirk suffers from being overly offensive, which also severely limits the variations of his prospective super moves.
But during a flashback in chapter 352, Shoto reveals that he recently learned how to activate his Flashfire Fist by using both sides of his quirk, rather than just one as he's normally done, resulting in Shoto having the capability to conjure cold fire. Although he uses this offensively while battling his older brother Dabi in the present day, Shoto's truly innovative utilization of this super move is for defensive purposes. Rather than summoning his mother's icy powers to cool his internal temperatures so that he can handle Endeavor's Hellflame as his father originally intended, Shoto can manipulate his cold fire around his upper torso in the shape of an "X," thereby cooling his body.
Very few heroes or villains have found ways to alter the overall nature of their quirk from offensive to defensive or vise versa. Even Shoto's more creative moves are all attack-based. For example, Flashfreeze Heatwave might expand the air around Shoto when he switches from emitting icy coolness to his father's flames, but the endgame is to maximize his offensive power when the sudden change in temperature enables him to release a superheated blast. One of the few other instances of characters achieving what Shoto has in My Hero Academia is the super move Phantom Menace performed by Mirio Togata aka Lemillion. Lemillion's Permeation quirk is so highly defensive that many users perceived it as a worthless ability. But Lemillion is able to utilize one of Permeation's side effects that repels him outward, allowing Lemillion to launch himself at his opponents with great bursts of speed to deliver powerful blows.
Although impressive, the overall creative nature of Lemillion's quirk inherently lends the variations of its uses to be equally as innovative, if not more so, diminishing the overall effect on the reader. Conversely, Shoto's powers have always been almost too straightforward, making this latest development in chapter 352 so much more impactful and unexpected. Unfortunately, Shoto's Great Glacial Aegir super move that is based on real science (as proven in chapter 351) appears to have ended the highly anticipated fight against Dabi, thus wrapping up what will likely serve as Shoto's final big battle. Fans would have undoubtedly welcomed it if Shoto had been able to develop another defensive type of super move utilizing Endeavor's Hellflame. And this isn't just because it would diversify Shoto's arsenal. It's because it would serve as another blow against Endeavor's control over Shoto Todoroki as his father has always used his Hellflame offensively to an absurd degree in My Hero Academia.