When you have to save someone, they're usually in a scary situation. A true hero saves not only their lives, but also their hearts... That's what I believe. So no matter how scary things get, give 'em a smile, as if to say, "I'm a-ok". The people in this world who can smile are always the strongest.Nana Shimura to Toshinori Yagi in "One For All"
Nana is described as a beautiful woman with a tough demeanor. She was a fairly tall woman of slender yet voluptuous frame, and at the same time, she was well-built, as befitting a One For All user. She was fair-skinned and had a small mole below her bottom lip, centered to the right, and sharp, intelligent eyes with long eyelashes. Her hair was dark and straight, kept shoulder-length with the exception of a clump of short bangs hanging above her forehead, and was usually styled in a half-up-half-down bun.
Her hero costume consisted of a dark, sleeveless bodysuit with a high collar, yellow elbow-length gloves, and white knee-high boots. Around her waist was a belt with an angular golden buckle, a small cape attached around the back which hung down to her knees, and over her shoulders was a longer cape, buttoned to the shoulders of her bodysuit.
Nana was a kind woman with a strong sense of justice. She believed that a true hero should smile, no matter how grim the situation, since people who needed to be saved needed not only to have their lives protected but also their hearts; she showed great empathy and emotional resilience. Furthermore, she was a loving mother to her son before she died at the hands of All For One, and was shown to be compassionate, nurturing, and supportive of him. However, to her own son Kotaro's perspective, she was rather sinful. In an episode of a flashback of Tomura's childhood, he comes across a picture of Nana in his father's room along with his sister, Hana. When Kotaro found out about the discovery of the picture, it is revealed that Nana abandoned young Kotaro due to her own incapabilities and consequences from her hero life as she could not take care of him properly. Nana did this of course for Kotaro's well being, but it ended up the other way. Kotaro apparently loathed his own mother for leaving her own family.
Although she initially regarded Toshinori Yagi’s desire to be a symbol of peace as somewhat crazy due to him being Quirkless, she nonetheless brought the matter up with her trusted friend Gran Torino. She subsequently took Toshinori as her student and successor, which is a testament to her openness and belief in the potential of others.
Overall Abilities: Nana's abilities are largely unknown, however, she is regarded as a great Hero by powerful individuals, such as All Might and Gran Torino. She was not strong enough to defeat All For One.
Trained Muscles: Usage of One For All requires the user to have strong muscles, as One For All is a lot to handle and could cause the user's body to be blown apart if they don't possess the necessary strength of the body.
One For All (ワン・フォー・オール Wan Fō Ōru?): Transferred to her from the sixth user, Nana's second Quirk allowed her to stockpile an enormous amount of raw power, allowing her to significantly enhance all of her physical abilities to a superhuman level. This results in unbelievable levels of strength, speed, agility, and durability.