Rosaria is a cold and distant nun of the Church of Favonius. She does not even remember the name of the Anemo Archon and prefers drinking to praying.

In the day, she receives confessions from sinners. At night, she is hired by the church to exterminate criminals to protect Mondstadt. It's secret, confidential work. She's a Cryo Vision holder. 

She was raised by bandits, but was saved by Grandmaster Varka when her gang was caught. 

"Everything's negotiable... Except overtime."