Shoto Todoroki, also known as Shoto, is the tritagonist of the My Hero Academia manga and anime series. Shoto's Quirk gives him the ability to generate ice from the right side of his body, and flames from his left side. Due to years of rejecting his father, Shoto has developed a habit of favoring ice, even when fire would be a better option. This grudge also caused him to have difficulty controlling his flames. While he is capable of using both elements simultaneously, he isn't used to doing this and still needs to practice dual-wielding. While training for his ultimate move, he claimed that using both abilities at the same time slows him down. If he overuses one element without utilizing the other, then his own body temperature will suffer; the ice half will cause frostbite and the fire half will cause heatstroke. Until his bodily limit is reached, however, neither has any visible effect on his body. Shoto can easily negate this weakness by alternating between ice and fire.
As part of his training, Shoto sat in a barrel of water and alternated between using ice and fire to regulate the temperature of the water. It helped his body become accustomed to the cold, and he learned better control over his flames. He is a student in Class 1-A at U.A. High School, where he got in through official recommendations and is training to become a Pro Hero. He is the youngest son of Endeavor, the No. 1 (formerly No. 2) Hero. Having been trained by his father, Endeavor, at a young age, Shoto entered U.A. High School through recommendations, and has been established as one of the strongest students in Class 1-A. He earned 2nd place in both the Quirk Apprehension Test and U.A. Sports Festival. Shoto also has a great handle over his versatile and powerful Quirk, Half-Cold Half-Hot, which grants him incredible dual-element capabilities. Using the right side of his body, Shoto can drastically lower temperatures and freeze anything he touches, and generate ice that he can freely mold into numerous constructs that include ice waves that cover large areas, and ice barriers. Shoto also employs his cryokinetic abilities for mobility purposes, such as stacking ice shards behind his back to propel himself forward, glaciating the ground to skate on it, or his signature move, creating trails of ice on which he can surf. From the left side of his body, Shoto can eloquently increase thermokinetics and release scorching hot flames in the form of consuming streams or protective waves. Overall, Shoto has tremendous power, but because of past decisions and circumstances, such as his intentional neglect of one half of his Quirk, he has yet to reach his full potential. At the U.S.J., Shoto was able to easily overpower small-time villains at the Landslide Zone by himself, and later on showcased elite judgment, combat awareness, and athletic ability during the U.A. Sports Festival. At the festival, Shoto was able to neutralize a Villain Bot-Executor, defeat his swift classmates, Hanta Sero and Tenya Ida, as well as fight on par with Izuku Midoriya for a prolonged period of time to a nigh-draw. In his battle against Izuku, a fan claimed that Shoto was already stronger than the average Pro Hero. When he was pitted against Katsuki Bakugo in the final round of the Sports Festival, there was a chance Shoto could've won the match using his fire powers, but due to inner turmoil, he extinguished his inferno, leaving him open to Katsuki's "Howitzer Impact", and losing the match. Starting with the Hosu Incident, Shoto began the full embracement of his left side, as well as his pyro-cryogenic interchangeability, particularly when he, Izuku, and Tenya faced off against the Hero Killer: Stain. Following his run-in with the Hero Killer, Shoto is recognized as one of strongest students of Class 1-A, as noted by Pixie-Bob. While Shoto may possess full supremacy over his cryomancy, the control over his pyrokinesis was initially relatively inept, especially in comparison to that of Endeavor. However, after the third match of the Joint Training Battle, Shoto realized that he had disregarded his left side for too long, which had put him and his team at a disadvantage, and resolved to achieve greater mastery over his pyrokinetic abilities by learning the fundamentals of "Flashfire Fist", Endeavor's signature technique. Thanks to his internship, Shoto's handling over his left side has improved significantly, as he can now use his pyromancy in a new variety of ways, such as boosting his movement speed, launching himself through the air, and attacking with blaze-powered punches. And though Shoto is powerful, contending with individuals such as Stain, Wolfram, Moonfish, Mr. Compress, Gang Orca, Chimera, and Tomura Shigaraki require Shoto's effective camaraderie with multiple people in order to prevail against such formidable opponents. That was hardly the case during the climax of the Paranormal Liberation War, wherein he faced his brother Dabi in a battle of flames that nearly resulted in Shoto being burned alive, had it not been for Izuku's brief intervention. As the body-charring Todoroki brothers resumed their full-power pyromantic clash, Shoto ended up losing, but Dabi chose to spare his brother, as it would've been pointless to kill him without Endeavor watching. During Class A's mission to bring Izuku back to U.A. after he left following the events of the war, Shoto displayed an even greater mastery over his cryokinetic abilities. In particular, his control over the shape of his ice has become much more refined, being able to form a massive vertical pillar of ice with Heaven-Piercing Ice Wall, and even being able to create a smooth curved ramp without the need of a solid framework. Furthermore, he's shown the ability to use his signature move, Flashfreeze Heatwave, without needing to cool the air down first; now he can simply put his hands together and unleash the power of both sides at once to create the same effect.