Pieck is shown to be somewhat sweet and kind, consistently shown to care about her fellow Warriors and the Warrior candidates. She is incredibly intelligent, able to quickly deduce a situation. When the Warriors were discussing the prospect of using the Tybur family to assist in their operations, Pieck was able to quickly figure things out, and Zeke Yeager implies this happens quite often. However, Pieck is usually shown to be quite eccentric and easy going. During the train ride to Liberio, Pieck gladly gave Colt Grice a drink when he asked for one, which led to him getting drunk and leading the other Eldian soldiers in a chant in favor of Gabi Braun. As a result of constantly being in her Titan form, Pieck has shown the habit of walking on all fours when few people are around, stating that it feels more natural and even curling up on a sofa like a cat; she is still capable of walking upright, although she occasionally requires a crutch to do so. She has been showing loyalty towards Marley since her childhood, fighting well for the country's interest, but actually wishing to have her people released from the persecution they face every day. She is also very concerned about the future of the Eldian race as a whole, due to recognizing that the world wants them gone and fears that they will not be of use anymore with the growing increase of technological advancements. Furthermore, her main reason for becoming a Warrior is to get her ill father money for his treatment. She did not display much grudge towards the inhabitants of Paradis Island and criticized her superiors' strategy. Pieck grew up in the Liberio Internment Zone and lost her mother early on in childhood; seeing that her father had gotten sick and would not survive long without proper medical care, Pieck joined the Warrior program as soon as she was eligible. After performing well enough to be selected to inherit one of the Marleyan Titans, Pieck was able to secure her father the treatment he needed. Despite this, Pieck recognized that her father now had a sadness in his eyes after learning that she would only live for thirteen more years due to the Curse of Ymir. Wanting to show her father that Eldia had a bright future ahead, she decided to try any way possible to free the Eldians in Liberio and Marley before the end of her thirteen years. After Pieck inherited the powers of the Cart Titan, she was kept in Marley along with Zeke Yeager as a deterrent to enemy nations while the other Warriors (Reiner Braun, Annie Leonhart, Bertolt Hoover, and Marcel Galliard) are sent to take part in the Paradis Island Operation in the year 845.