Lavinia Liberus trains as a cadet at the Basion Tactical Training School, specializing in operating specialized mecha units called Strains. Her lighthearted, dreamy, and eccentric personality frequently distracts her during military activities, causing academic and tactical underperformance that contrasts with her unwavering cheerful disposition.

She harbors intense romantic feelings for fellow cadet Sarah Cruz, driving her to repeatedly devise plans to charm and pursue Sarah. These efforts consistently fail due to coincidental circumstances, not deliberate interference. Sarah’s lack of romantic interest in individuals of the same gender renders Lavinia’s pursuit one-sided, yet she remains persistently dedicated to her romantic goals despite repeated setbacks.

This fixation increasingly monopolizes Lavinia’s focus, causing her concentration on military duties to deteriorate. Her single-minded absorption in pursuing Sarah escalates over time, diverting attention from training and obligations. Unintentional interference in her romantic attempts fuels growing frustration and obsessive tendencies.

Lavinia presents a feminine demeanor and is habitually late due to her dreamy, distracted nature. As a Reasoner, her role involves piloting Strain units in combat or tactical scenarios. She possesses purple hair and eyes.