Isolde is a playable character in Reverse:1999. She is an Opera Singer that could let the spirits of the dead to possess her and perform authentic acting. She is the friend of Kakania.
She is revealed to be a member of Manus Vindictae, helping them assassinating important figures of her era, and accelerating World War 1. In the end, she was captured by The Foundation, but she enters deep illusion due to PTSD, thinking she still in Vienna.
She is voiced by Ella Jonas Farlinger in English and Asakura Azumi in Japanese.