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Petra has short, light hair with bangs swept to the left side. She wears a white blouse underneath a dark sweater along with a dark skirt.
Initially, Petra was seen as a cheerful and kind girl. This attitude reverses, and later shows a rather violent side, especially to Oluo, such as kicking him in the stomach and showing no excessive care when he bit his tongue.
Petra is part of the Survey Club and takes part in a meeting when several first year students try to gain entry. Her classmate Oluo goes to stop them, only to fall back and bite his tongue due to Eren slamming the door on his head. After she joins Eld and Gunther in mocking Oluo, she confirms that they cannot just allow anyone to join. Petra reveals the first years need unanimous agreement by the three heads of the club before they can join. She sees two of them, Hange and Mike, return and welcomes them back. Petra reveals to Hange the first year students who are looking to join the club, and joins them in looking at Hange's jar of Titan nail clippings in disgust.