Keith Goodman, known to the public as the hero Sky High, is a central figure in the hero community of Sternbild. His background is not extensively detailed, but it is known that his NEXT powers, which allow him to manipulate the wind, first manifested when he was eighteen years old. Before the start of the series, he established himself as the city's most popular and consistently top-ranked hero, holding the title King of Heroes for what seems to be multiple seasons due to his exceptional performance and public appeal.

His personality is marked by an unwavering sincerity, a deep sense of duty, and an almost earnest politeness that can come across as socially awkward or even airheaded. Keith operates with a very clear, black-and-white sense of justice, believing firmly in the law and the importance of heroes serving as role models for the citizens. This is reflected in his signature catchphrase, "Thank you, and again, thank you," which he uses to express his genuine gratitude for the support of others. He takes his responsibilities with the utmost seriousness, adhering strictly to instructions and rarely showing any sign of showboating or abusing his considerable power. In fact, he is often shown being careful not to cause unnecessary harm to the criminals he apprehends. Beneath this cheerful and confident exterior, however, lies a profound fear of failing the expectations of the people who believe in him.

Keith's primary motivation is a selfless commitment to the protection of Sternbild and its citizens. He genuinely believes in the ideal of heroism and sees his power as a gift that comes with great responsibility. This drive goes beyond the commercial aspects of Hero TV; in his free time, he consistently spends his evenings patrolling the city on his own, a habit he has maintained since his debut. He does not seek personal glory but rather finds satisfaction in the act of keeping people safe, even if they never know it was him. This pure-hearted devotion to service is a core part of his character.

Within the story, Keith functions as the de facto leader and moral compass of the hero team. His colleagues, including rivals like Rock Bison, hold him in high regard and trust his judgment, often finding themselves agreeing with his suggestions when they might dismiss the same ideas from others. He is depicted as a supportive and encouraging figure who applauds the successes of his fellow heroes. However, his role also involves experiencing significant personal trials. His first major on-screen crisis occurs when he is defeated in a publicized battle by the villain Jake Martinez. This loss shatters his confidence and sends him into a slump, causing his performance and ranking to drop, which troubles both him and his sponsors at Poseidon Line. This event forces him to confront his deepest insecurity: the fear of being unable to live up to the hopes that others place in him.

A key relationship and moment of development comes in the form of a young woman named Cis, whom he meets in a park while struggling with this crisis of confidence. He is drawn to her and, in a series of one-sided conversations, confesses his fears and self-doubt. Her simple, repeated question of "Why?" prompts him to re-evaluate his mindset, leading him to overcome his slump and regain his heroic resolve. The tragedy of this relationship is that Cis is not a person but an advanced android designed to surpass NEXTs. Keith is forced to destroy the rampaging android with his full power, never realizing that it was the same being to whom he had poured out his heart. The next day, he returns to the park bench with flowers to thank her, waiting for someone who will never arrive. This heartbreaking event solidifies his regained confidence, but leaves an underlying note of pathos to his optimism.

Later in the story, Keith's memories are manipulated by the villain Albert Maverick, who erases his knowledge of Kotetsu Kaburagi, also known as Wild Tiger. Under this influence, he is forced to hunt down a former comrade, an experience that highlights his unwavering commitment to what he believes is the correct path, even when that path is based on a lie. He remains a loyal and powerful ally, always ready to support the other heroes in battle, and his sense of duty never wavers even when he is placed in life-threatening situations, such as when a bomb is attached to him.

As Sky High, Keith possesses the NEXT ability of wind manipulation. He can generate powerful gusts, create compressed balls of wind as projectiles, and form large, spiraling vortexes for devastating offensive attacks. He can use gentler currents to slow the fall of civilians. While he cannot achieve true flight through his power alone, he uses his jetpack for propulsion and his wind control to float and maneuver himself masterfully through the air. His signature finishing move, simply called Sky High, involves launching himself as a destructive, tornado-like projectile. His power is substantial, capable of tearing through advanced military-grade androids. He is widely known by nicknames that reference his abilities, such as the Wind Wizard.