Rosaria was born in a remote mountain village, but was taken from her home shortly after birth by the very same bandits who drenched it in blood. Raised by those crooks, she learned how to fight, sometimes thieving, other times doing odd jobs for the crew. She fought against outsiders and her comrades alike, and growing up was a constant battle for survival against the hunger and cold. Zack is Biological brother of Rosaria. She is the backstory of Rosaria from Genshin Impact and she is 16 years.