Attack on Titan has entered the real world.

Face and features. Mikasa has Asian features, fair (slightly pale) skin, and gray eyes. She has a small scar under her right eye; she received it during the Battle of Trost, when Eren, in his Titan form, accidentally touched her.
Hair. Black, quite long at the beginning of the story, she later shortened it for combat convenience—so it wouldn't interfere with the use of spatial maneuvering equipment. By 854, her hairstyle had become even shorter and slightly more disheveled, but a longer strand remained in front.
Build. Tall (around 176 cm), slender, yet very muscular—she's one of the strongest human fighters, and it's evident in her figure. Despite her muscular development, her silhouette remains graceful.
Clothing. Wears the standard Survey Corps uniform: a white shirt, some equipment, and a green cloak with the corps emblem. Footwear includes tall black boots and numerous belts and attachment points for equipment.
The main detail of her look is the dark red (dark brown in the manga) scarf that Eren gave her after he saved her from kidnappers. Mikasa almost never takes it off: the scarf is an important emotional symbol for her.

Build: Muscular, medium height. After training in the cadet corps, his muscles became more pronounced, although baggy clothes sometimes hid this.
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Face: Quite long, but rounded. Eren inherited his mother's facial features.
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Eyes: grey in the manga, turquoise in the anime.
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Hair: Dark brown and fairly long in the manga, gray-brown in the anime. At the beginning of the series, his hair was short, with bangs parted naturally. Later, by EC 854, he grew it shoulder-length. At one point, Eren wore his hair tied back in a bun.
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Skin: slightly tanned.
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Clothing: Changed depending on the storyline. Initially, he wore typical urban clothing (brown pants, shirt, coat). During his service in the Survey Corps, he wore the standard uniform. Later, during the mission to Marley, he wore bandages (on his forehead and left eye), as well as an Eldian eye patch. After returning to Paradis Island, he shaved his mustache and goatee and began wearing a white shirt with dark pants under a black robe.
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Detail: Eren always wore the key he received from his father on a string around his neck.
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As a young member of the Survey Corps, Armin wore the standard uniform: a brown jacket over a white collared shirt, long brown boots reaching almost to the knees, and a distinctive green expedition cloak—worn during forays beyond the walls. His slight build and short stature made him noticeably more graceful than other soldiers, and his blond hair and large eyes still stood out against the formal attire.