Anna Liebert Character Guide at PopRot

August 15, 2026 · Anime, Characters, Monster

Spoiler note

This PopRot profile discusses the character’s broad role and motivations without retelling every late-series reveal beat-by-beat.

Who they are

's twin sister and the only unharmed survivor of the night when both her parents and her brother were shot in what appeared to be a botched burglary. At first she showed signs of amnesia due to the psychological trauma of the incident. After she and her brother disappeared, she was adopted by the Fortner family from Heidelberg, who were unaware of her previous identity as Anna Liebert. As Nina Fortner, she was a hardworking law student at an unnamed university (likely the University of Heidelberg), as well as an adept practitioner of Aikido. She lived her life in peace until Johan made contact with her on her twentieth birthday. She comes to pursue Johan, albeit by different methods and for a different reason than .

Role, personality, and story relevance

Anna Liebert functions as a main character within the thriller structure. PopRot frames their role around how they pressure the central question of the series: whether saving a life can also create responsibility for what that life later becomes.

Abilities and methods

Monster is not a battle-power series; “abilities” here means intelligence, professional skill, manipulation, investigation, survival instincts, or social influence. This character guide treats those traits as story tools rather than superpowers.

Key facts