|Hair Color||Light Brown|
|First Appearance||Phase 1: For You, the Replaceable Ones|
She is currently serving time as a Class 1 Criminal (her crime is not public knowledge), but has been allowed to leave in exchange for volunteering as a research subject at the Geroy Level 4 Heavy Military Research Center.
Her grades at the Suomenlinna Aerial Augmented Infantry School before her arrest were incredible, and her records at that school still haven't been broken.
Large changes have been noticed in her personality and character since her imprisonment, and some sort of experiment at the research center is rumored to be the cause.
Lilja appears as a young girl with long light brown hair and green eyes. Her mouth is distinctly "catlike". She typically wears a modified dirndl with a red ribbon and two hair accessories resembling cinnamon buns.
Lilja has some catlike qualities; her mouth occasionally takes on a catlike shape and she often ends sentences with "meow".
- In Phase 1: For You, the Replaceable Ones, Lilja says "Nipanipah", a variation of Rika Furude's catchphrase "Nipah~".