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Lynne had long, dark, messy hair that she kept in a ponytail with her bangs parted down the middle. She wore the traditional uniform of the Survey Corps with a white shirt underneath.
Lynne is one of several soldiers including Gelgar, Henning, Thomas, and Nanaba brought by Mike Zacharias to oversee a group of potentially untrustworthy Survey Corps members. The group was assembled close outside of Wall Sheena and disarmed of their weapons due to the suspicion that one of them might be an accomplice to Annie Leonhart.
Before an investigation could begin, Titans appear within Wall Rose. Mike orders the group to split into four squads to warn the nearby villages. Lynne is in the south squad, headed by Gelgar. Lynne comforts Connie Springer when he fears his family had been eaten by Titans while they investigate his home town, saying they probably all escaped due to the lack of blood and bodies. The squad rejoins with Nanaba and Henning's squad after failing to find any breach in Wall Rose. As night falls, the two groups take refuge in Utgard Castle.
Utgard Castle soon comes under attack from numerous Titans capable of moving during the night. Since the soldiers who had been under suspicion do not have vertical maneuvering equipment, the only ones able to directly engage the Titans are Lynne, Gelgar, Henning, and Nanaba. However, when Lynne and Henning separate from Gelgar and Nanaba to check on the rookies within the castle, they are both struck by a projectile thrown by the Beast Titan and killed instantly.
Later in the Battle of Shiganshina, as Erwin Smith begins to lament the dwindling hopes of his dream, Lynne stands among the many fallen Survey Corps comrades in Erwin's mind, wanting to know if their deaths had meaning.