Theresa Traser is a German actress who became known primarily for her role as Ronja Pfeiffer in the RTL daily soap Unter uns. She has portrayed this role since May 2023. Previously, she played the character Lena in the German indie film Einmal richtig, released in 2024. She completed her acting training from 2021 to 2024 at the Zerboni Acting School in Munich. For her permanent engagement at Unter uns, she moved from Munich to Cologne during her second year of training.