Waldstein is an old man with relation to both the Night Blade and Licht Kreis. He accompanies Linne in her search for a means to end her life. He is one of the twelve characters introduced in the original version of UNDER NIGHT IN-BIRTH. Having been in countless battles, Waldstein enjoys fighting skilled opponents and is always prepared to accept a challenge. However, he appears to be rather absent-minded as he openly stated to Gordeau that he was serving as a distraction while Linne and Hyde were heading to take down Paradox and wasn't aware of the implications of doing so until Gordeau explained it to him. Despite Waldstein's hunger for battle, he has a softer and compassionate side to him, especially towards Linne. He is extremely loyal to her, following her orders without question and worrying about her well-being. He also spares Hilda's life to "return the favor" for sparing Linne's. In his monstrous body, Waldstein consumes roughly thrice the normal amount of food needed for one man, possibly even ten times the normal amount if it so happens to be his favorite food.