Ruberan Tser

Personal history
She's a member of the "patrolling units" in Helman. (Lack of a better term)

She's the sister of Merim, the young archeologist that accompanied the Helman exploration platoon in Ylapu in Rance IV.

Appearances
She appeared first in Kichikuou Rance. She's the reason why Rance's thieves group was captured and Rance had to flee to Leazas. It is in this game, if the player recruits Merim, that it's explained that Merim and her are sisters.

She appears in Rance Quest as well during Rance's mission at Lionsheart, Alkaneze's thieves group's headquarters at the time. Rance naturally doesn't have any real memories of the events of Kichikuou, but he claims that Ruberan gave him a hard time and gets pissed off only by looking at her.

In Rance IX she's tries to arrest Rance for crimes he committed the last time he was in Helman, all of them involing rape, but she's defeated and caught by Rance.