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Mina was a young girl with a slender figure and of average height. Mina had thick black hair that extended past her shoulders. Her hair was parted in the middle and tied in loose pigtails. On missions, Mina dressed in the standard trainee uniform. When off duty, Mina wore a long-sleeved blouse and dark pants.
Mina was a cheerful girl, seen when she happily took Sasha Blouse up on her offer of meat that would be restored when they retook their land, but she was also rather brave when she went after Eren Yeager even after Thomas Wagner was eaten by an abnormal Titan.
In her early trainee days, Mina is interrogated by Keith Shadis during the introduction ceremony. On the first night, she and her comrades gather around Eren Yeager after hearing about his survival of the fall of Shiganshina District.
After graduation, Mina is seen cleaning the cannons with her comrades atop Wall Rose. During this time she insinuates that she is interested in joining the Survey Corps due to Eren's motivational speech the night of their graduation, as many others are as well. Mina is among the trainees who accept Sasha Blouse's meat despite it being stolen from the senior officers' private stock, and witnesses the sudden return of the Colossus Titan.
When the Colossus Titan appears outside Trost District, Mina can only watch in horror as the burst of steam from its body knocks the Trainees off the Wall. She is present when Eren Yeager orders them to attack the Colossus Titan. After the breach, she was assigned to the middle guard along with Eren and Armin Arlert, Mylius Zeramuski, Nac Tias, and Thomas Wagner.
They eventually are incorporated into the front guard due to the number of Titans. Eren begins talking about how killing Titans that got in Trost will improve their rank, and she joins him, indicating that she is also signing up for the Survey Corps. Thomas suggests they have a contest on who can kill the most Titans.
Finally, the whole squad advances forward towards the numerous Titans. Surprising the group, an abnormal Titan lunges at the roof top they were standing on. The group watches in horror as Thomas is swallowed by the Titan. Eren initially attacks the Titan that swallowed Thomas, followed by Armin first and Mina second.
After Eren's leg is bitten off suddenly by one of the Titans, she and the other two soldiers attempt to kill the Titan that injured him. As she attempts to kill it, the Titan happens to catch its arm on her vertical maneuvering equipment grapple wire and causes her to crash against the Wall and then down to the ground, knocking her into a daze. A Peering Titan spots her just before she gathers herself and then goes on to pick her up and bite most of her head off as she struggles, killing her as other trainees die around them.
Armin would later report her demise to the remaining members of the 104th Training Corps, saying she died valiantly in the line of duty. Her death would later be avenged by Mikasa Ackerman, who kills the Titan responsible for her death when it attempts to kill Sasha.
During the Survey Corps feast before the battle of Shiganshina District, Connie says there was a time when Sasha would have shared meat. When Eren asks when this was, Connie reminds him of three months ago in the moments before the Colossus Titan's attack on Trost when Sasha had attempted to share stolen meat with them. Eren recalls Mina's presence during this moment.