Eren grew up in the Shiganshina District trapped inside giant concentric walls protecting humanity from giant humanoid monsters called Titans. A colossal breach in the wall resulted in his mother being eaten alive. This horrific event sparked an intense, consuming hatred. He vowed to join the military and slaughter every last Titan on Earth Eren starts as a passionate, hot-headed soldier in the Survey Corps.

She graduated top of her military class and became the Survey Corps' strongest asset next to Captain Levi, capable of taking down multiple Titans with ease. Due to her past trauma, Mikasa developed an intense, protective fixation on Eren, prioritizing his safety above all else.

As a member of the Ackerman clan, his awakened power makes him a lethal whirlwind on the battlefield. He is capable of single-handedly incapacitating or killing major Titan threats, most notably defeating the Beast Titan multiple times. Beyond physical combat, Levi possesses exceptional battlefield judgment, moving with speed and precision that surpasses all other human soldiers.He wear a title as the strongest human.

Hange is hyperactive, intensely curious, and deeply passionate about studying Titans. While others view Titans with terror, Hange approaches them with scientific wonder. Hange famously named captured Titans (like Sawney and Bean) and wept when they were killed or experimented on, showing a rare empathy for humanity's enemies.

Armin suffers from deep self-doubt and initially views himself as a burden. However, his brilliant mind repeatedly saves the main characters, his dream to see the outside world—specifically the flaming water, lands of ice, and fields of sand—which heavily inspired Eren's own quest for freedom. Armin feels things very deeply, which frequently leaves him carrying a lot of sadness and guilt.

Erwin is a man of intense focus and extreme emotional control. He rarely showed fear or hesitation, which allowed him to make brutal, split-second tactical decisions on the battlefield. Behind his stoic mask, Erwin was deeply haunted by the mountains of corpses his orders created. He viewed himself as a "monster" who tricked young recruits with visions of hope, only to lead them to slaughter. He possessed an unmatched, booming eloquence. He was capable of inspiring his soldiers to charge into certain death with his legendary, spine-chilling speeches

Jean is pragmatic, blunt, and says exactly what is on his mind, which initially earned him a reputation for being cynical and combative (especially with Eren).Deeply Relatable: Unlike Eren (who is driven by extreme vengeance) or Mikasa (who has superhuman abilities), Jean experiences normal human fear, self-doubt, and a desire for a comfortable, safe life.Naturally Funny (The Straight Man): Jean provides a lot of natural comedy in the series. His dynamic with Connie is hilarious, and his constant frustration with Eren’s reckless behavior makes him the perfect "straight man" to the chaos around him.

Annie values her own survival above all else. She openly mocks the military system and respects people like Armin and Marlo, who stick to their morals even when it is hard. Annie is quiet, independent, and likes to keep her distance from others. She isn't interested in making friends or joining in on the loud, chaotic energy of the other cadets.

Sasha is incredibly friendly, warm, and deeply loyal to her friends. Though she can be a bit of a coward when facing terrifying situations, her bravery shines through when it matters most, especially if she needs to protect innocent people. While she uses regular military gear against Titans, Sasha is a prodigy with a bow and arrow. Her hunting background also makes her one of the military's absolute best long-range marksmen.

Reiner is dependable, strong-willed, and possesses an excellent tactical mind. He always steps up to protect his comrades, leading from the front line. He has a massive heart and an honest disposition. He earned the immense respect of his peers—especially Eren, who deeply admired Reiner's strength and maturity and viewed him as a role model.