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.
On the first night of her days in the 104th Training Corps, Mina joins a handful of other trainees in watching Sasha Blouse run laps around the training grounds as punishment for eating during their opening ceremony. As they go to eat dinner, the trainees discover that Eren Yeager is a survivor from Shiganshina District and begin to bombard him with question about its downfall.
After graduation, Mina is seen cleaning the cannons with her comrades atop Wall Rose. 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. She accepts 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 and her fellow trainees are knocked off the wall by a blast of steam. Eren orders them to attack the Colossus Titan, but she is frozen in fear.
After the breach, she was assigned to the middle guard along with Eren and Armin Arlert, Mylius Zeramuski, Nac Tias, and Thomas Wagner. They are positioned as part of 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.
The squad advances forward towards the numerous Titans, but are surprised by an abnormal Titan lunges at the rooftop they were standing on. The group watches in horror as Thomas is swallowed by the Titan. Eren begins to pursue the Titan, and the squad follows him.
After Eren's leg is bitten off suddenly by one of the Titans, she attempts to kill it, but a Titan happens to catch its arm on her vertical maneuvering equipment grapple wire and causes her to crash against the Wall. Before she can gather her wits a Titan picks her up and bites her head off, killing her.