Attack on Titan is critically acclaimed and one of the most popular anime series of all time. Comprised of four seasons, the show ran from April 2013 to December 2020. It is based on the manga, published by Kodansha, and produced by Wit Studio and MAPPA.
In the story's world, enormous man-eating humanoid creatures called Titans threaten humanity. To survive, human society took refuge inside cities surrounded by three enormous walls that protect them from the Titans. This civilization fights back against the Titans with grappling hooks and sharp blades, which allow the military to swing around their assailants and slice open their necks, killing them.
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Both the anime and the manga follow Eren Yeager, along with his friends and comrades Mikasa Ackerman and Armin Arlert, who are a part of the Survey Corps branch of the military. Other main characters include leaders such as Levi Ackerman, Erwin Smith, and Hange Zoe. Other Survey Corps members fighting alongside the protagonisst are Reiner Braun, Bertolt Hoover, and Historia Reiss. Eventually, all of these main characters meet Zeke Yeager, Eren's half-brother (who is not a part of the Survey Corps).
10 Eren Yeager
Eren Yeager, the main protagonist, was born on March 30th. When the show begins, he is 10 years old. For much of the plot though, Eren is 15 years old (in the year 850). Towards the end of the series, after the four-year time skip, he is 19 years old.
Over the show Eren grows from 170 centimeters (5'7") tall to 183 centimeters (6'0") tall. He weighs about 63 kilograms (140 pounds). (This all applies to his human form, of course, not his Pure Titan or Attack Titan forms.)
9 Mikasa Ackerman
Mikasa Ackerman was born on February 10th, and is 11 years old at the very beginning of the show. In the year 850, when most of the plot takes place, Mikasa is 15 years old. Of course, by the end of the show and after the time-skip, she is 19.
Mikasa grows from 170 centimeters (5'7") tall to 176 centimeters (5'9") tall. She weighs 68 kilograms.
8 Armin Arlert
Armin Arlert was born on November 3rd, and is 10 years old in the first episode of the show. During most of the series in the year 850, Armin is 15 years old. After the time skip, he is 19 years old.
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Armin goes from 163 centimeters (5'4") tall to 168 centimeters (5'6") tall. He weighs 55 kilograms (121 pounds). (This all applies to his human form, obviously, not his Colossus Titan form.)
7 Levi Ackerman
On December 25, Christmas Day, Levi Akherman was born. By the year 850, when the viewer meets him, he is in his early 30's. Levi's exact age is unknown, but after the time skip, it is assumed he is in his late 30's.
Levi is 160 centimeters (5'3") tall and weighs 65 kilograms (143 pounds). Neither his height nor weight changes throughout the series.
6 Erwin Smith
Erwin Smith's birthday is October 14th. When the viewer first meets him in the year 850, he is probably in his middle 30's. His exact age is unknown, but Erwin is likely around the same age as Levi or a couple of years older.
As for his height and weight, this leader is 188 centimeters (6'2") and weighs 92 kilograms (203 pounds).
5 Reiner Braun
Reiner Braun's birthday is August 1st. Although the viewer meets him when he is 17 years old in the year 850, eventually they learn he was just 12 years old when Reiner set foot upon Paradis Island. This means after the four-year time skip, he is 21.
Over the course of the series, Reiner goes from 185 centimeters(6'1") tall to 188 centimeters (6'2") tall and 95 kilograms (209 pounds) to 83 kilograms (183 pounds). (This all applies to his human form, not his Armored Titan form.)
4 Bertolt Hoover
On December 30, Bertolt Hoover was born. As with Reiner, the viewer meets him when he is 17 in the year 850, but at some point in the story they find out Bertolt was only 12 years old when he came to Paradis Island.
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His height is 192 centimeters (6'4"), and his weight is 81 kilograms (179 pounds). (This all applies to his human form, not his Colossal Titan form.)
3 Zeke Yeager
On August 1st, Zeke Yeager was born. For most of the show, he is 25 years old (in the year 850). During the final season after the time skip, Zeke is 29 years old.
Eren's half-brother is 183 centimeters tall and weighs 92 kilograms. (This all applies to his human form, not his Beast Titan form.)
2 Hange Zoe
Hange Zoe was born on September 5th. She makes her first appearance in the show at 28 years old (potentially 29 years old, as her exact age is unknown). During the final season, Hange is somewhere between 32 and 33 years old.
Hange has a height of 170 centimeters (5'7") and a weight of 60 kilograms (132 pounds).
1 Historia Reiss
On January 15, Historia Reiss was born. She is introduced to the viewers at 15 years old in the year 850. Following the four-year time skip, Historia is 19 years old throughout the final season of the show.
This Survey Corps member is only 145 centimeters tall (4'9") and weighs 42 kilograms (93 pounds).