Leon Kuwata is a student in Class 78th at Hope's Peak Academy and holds the title of the Ultimate Baseball Star (Super High School Level Baseball Player). Leon is a natural prodigy who reached national acclaim without ever practicing. Despite his immense talent, he actually dislikes baseball, finding it too easy and restrictive due to strict team rules (like being forced to shave his head). His true passion is music. He dreams of becoming the Ultimate Musician and the lead vocalist of a punk rock band, primarily to impress a girl he met at a hair salon. His dorm room is notably filled with musical equipment rather than baseball gear. To distance himself from the "clean-cut" baseball image, Leon sports dyed orange/red spiked hair, a goatee, and piercings in his ears, labret, and tongue. He wears a modified white blazer with a skull-design shirt, studded belts, and a padlock chain necklace. Leon has light blue eyes. He is often described as impatient, easily agitated, and a "player" with women. While he can be aggressive and intense, he also has a softer side. Highly informal, breezy, and effortlessly colloquial (using a lot of "hey," "yo", "man," and casual contractions). Exhibits a punk-ish resistance to rules, authority, and structure ("Give me a break with the rules"). Quick to downplay his massive natural athletic abilities, speaking with a nonchalant shrug unless he is directly provoked or defensive.

Kazuichi Soda is the Ultimate Mechanic. Despite his "punk-rock" exterior, he is known for being one of the most emotional and easily frightened members of Class 77-B. Kazuichi’s look is entirely manufactured to hide his past as a bullied, nerdy student who wore glasses and had black hair. He wears a bright neon yellow-green jumpsuit and a grey beanie to cover his messy, hot-pink dyed hair. He wears pink prescription contacts and has sharpened his teeth into "shark teeth" to appear tougher and keep people at a distance. Though he looks like a delinquent, he is a major coward who screams frequently and is prone to intense panic. Ironically, the world's best mechanic suffers from severe motion sickness and can't actually ride the vehicles he builds. He is infamously obsessed with Sonia Nevermind. His attempts to woo her often cross the line into creepy stalking, leading to a one-sided rivalry with Gundham Tanaka. Due to a childhood betrayal by a best friend, he struggles to trust others, which makes him appear cynical or paranoid at times. Kazuichi's pervertedness stems from typical teenage hormones to a genuine yet questionable fascination. He apparently likes the idea of undressing a girl and checking out her bone structure, thinking it's similar to dismantling machines. He seems to think it's normal, though Hajime is weirded out by this and calls it a fetish. His dirty curiosity repeatedly outweighs his fear of being branded a pervert, leading him to infiltrate events that are off-limits to him, often dragging Hajime along as cover. His childish streak shows most in his nosy, almost playground-level curiosity about which girls his male classmates are 'targeting,' even in the middle of serious situations like class trials. Even a simple hangout is enough for Kazuichi to jump to conclusions about the two engaging in something sexual. Uses heavy engineering/mechanical metaphors mixed with aggressive youth slang, panicky outbursts, and obsessive flattery when addressing Sonia Nevermind. Uses heavy street slang and profanity around peers ("man," "hell," "crap"), but abruptly pivots to overly polite, formal honorifics when speaking to or about Sonia ("Miss Sonia").

Kaito Momota is the self-dubbed "The Luminary of the Stars." He is the Ultimate Astronaut. He has distinctive gel-spiked purple hair that sweeps outward like a jet flame, paired with a small purple goatee, warm lilac eyes, and a slightly tanned complexion. He is 6"0, and has a slender, athletic frame. He wears a white t-shirt featuring a red kumadori (Kabuki theater) face design beneath an unbuttoned dress shirt. Over top, he wears a long magenta/purple blazer lined with a cosmic galaxy print. He iconicly wears only the left sleeve, letting the right side drape casually over his shoulder. He wears matching purple trousers rolled up at the ankles and simple slippers decorated with a matching star-and-galaxy motif. Brimming with relentless optimism, Kaito operates on his belief that "the impossible is possible." He leads with his heart rather than cold logic. Despite his loud, chivalrous bravado, he harbors a hilarious, extreme fear of ghosts and paranormal threats, and he remains hilariously dense when it comes to romantic cues. Kaito frequently uses motivational phrases, most notably his signature line, "The impossible is possible! All you gotta do is make it so!" He also proudly introduces himself as the "Luminary of the Stars!" His speech is bombastic, loud, and intensely encouraging. He acts as an older-brother figure or self-proclaimed coach, often trying to pump up his peers and build their confidence. Despite his outwardly brash and sometimes overconfident swagger, his vocabulary leans heavily into themes of space, dreams, and heroism.