Atsumu and Osamu Miya

Osamu Miya (Japanese: 宮みや 治おさむ, Miya Osamu) was previously a second-year student at Inarizaki High. He played as a wing spiker on the volleyball team. He is the twin brother of Atsumu Miya.
Appearance: During childhood, Osamu is shown to have black hair. Sometime after junior high, Osamu dyed his hair grey. Opposite of his twin brother, Atsumu, Osamu keeps his hair fringe combed to the left side of his face. He has grey eyes with hooded eyelids. Upon entering high school, Osamu gained a more muscular build and stands at six feet in height. Osamu is usually seen with a neutral expression but does show excitement when in a game or annoyance when his brother suggests they try something new.
Personality: Osamu appears to be the calmer of the Miya twins with a laid back and deadpan personality. Despite his outward demeanor, Osamu is highly competitive and becomes heated even if it isn't obvious on the surface. However, with enough provocation, he gets angry and physical. In that state, he abandons his filter and begins spewing profanity. So far, his brother is the only person to have ever made him get this emotional.
Osamu is also shown to have a large passion for food. He thinks about it often in the middle of a match and would get distracted by the smell of it. He can't seem to pick a favorite food and wouldn't know what to eat as his last meal. Like his brother, he loses self-control when it comes to eating. In his second year, he decided he would quit volleyball after high school in order to pursue a food-related occupation, which is how he eventually came to establish Onigiri Miya.During their childhood, Osamu was shown to be the more approachable twin as others found him easier to get along with. Even during grade school, Osamu was quite observant as he saw how his classmates disliked how demanding Atsumu was and how his brother enjoyed volleyball more than he did while not being concerned about others opinions of him.

Atsumu Miya (Japanese: 宮みや 侑あつむ, Miya Atsumu) was a second-year student at Inarizaki High and was the starting setter for the Boys' Volleyball Team. He was known as Japan's best high school setter and server.
He has a twin brother, Osamu Miya.
Appearance: During childhood, Atsumu is shown to have dark brown hair. Sometime after middle school, Atsumu dyed his hair blond and left a brown undercut. Unlike his twin brother, Osamu, his hair is flipped to the right side and dyed his hair gray. Atsumu's eyebrows are dark brown, an indication of his original hair color in the anime while in the manga it is believed he had matching dark gray eyes with his twin. His brown eyes are large, hooded, and slightly drooping. He can usually be seen wearing a smile or smirk on his face.
Personality: Outwardly, Atsumu appears to be a carefree, confident person who's usually seen with a lazy smile on his face, though he enjoys provoking people and giving offhand compliments. He can be quite condescending, and somewhat selfish at times. Osamu has described him as someone who doesn't listen to others, doesn't return what he borrows, and lies habitually.
He also appears to be a perfectionist who has ridiculously high standards for himself and his spikers, which has caused several teammates to dislike him, but he appears unconcerned about their opinions. He strives to provide the best toss for his spikers, but in turn, expects the spikers to perform at a high standard. If the spikers fail to meet his standards, Atsumu is not afraid to confront them directly and even call them trash, including his own twin brother. He is extremely sensitive when it comes to serving and how much noise is around him; if he's disturbed while serving, his outward personality changes completely, and he becomes intimidatingly angry towards the disturbance.
Atsumu is a competitive person who hates losing; sometimes, these traits can veer off in a bad direction.