A signature of Kürsch's songwriting is his practice of overdubbing his own voice multiple times in complex, overlapping harmonies on his recordings, creating the atmosphere of a huge choir. The track "Chant" on the first Demons and Wizards album is vocal only, in the style of a traditional Gregorian Chant; Kürsch's is the only voice on the song.
Kürsch's lyrics revolve around various themes prevalent in the power metal genre, including medieval fantasy, J.R.R. Tolkien, religious/mythological tales, and legends/stories, both his own and from the literary world. Many of his lyrics also exude a dark, cynical, and negative feel, spoken from a first-person perspective. His lyrics in the first Demons and Wizards album tackle even darker themes, telling tales of death, deception, and evil, whereas "Touched by the Crimson King" was based primarily off different fantasy novels.