She grew up in the same orphanage as Bronya and Seele, along with her sister, Rozaliya. Due to an accident, her body has been modified. A prominent side effect of the modification is that she experiences extreme sleepiness at exactly 7 PM (19:00) every day. The exact reason for this is unknown.
Liliya has long, pale mint hair, periwinkle-blue eyes with lighter pupils and fair skin.
She is the calmer of the Olenyeva twins and often takes the role of a straight man in their comedic duets. Similarly to Bronya, she would often call out her sister as "Rozaliya Idiotka", not unlike how Bronya also calls Kiana.
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