Mina Carolina was a graduate of the 104th Training Corps who fought during the battle for Trost District.
Mina was a young girl with a slender figure. She was considerably shorter than her comrades, even shorter than Historia. 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.
Appearance: Mina was a young girl with a slender figure. She was considerably shorter than her comrades, even shorter than Historia.
Personality: 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.
Mina Carolina in the story: 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.
How Mina Carolina echoes later: While speaking to Historia Reiss under the Reiss Chapel, Eren Yeager mentions Mina as being among the victims he and Grisha Yeager are responsible for killing by stealing the Titan's power.
Source: Attack on Titan Wiki, available under CC BY-SA 3.0.