Gisil first appears disguised as an innocent girl, pretending to be attacked by the Flyaway Falcons, a clan of assassins. However, when the player approaches her, she reveals herself to be actually one of them by attacking the player.
In later events, she constantly attacks the player during various episodes, when in the second-to-latest episode, she reveals her name, and swears to kill the player. In the latest episode where she appears, she teams up with Wilhelmina to try to kill the player. Gisil appears to be higher than Urias and Ludo in terms of hierarchy.