Yufinley Tsuge leads the Tsuge Divine Music Player Office as its boss, managing Dantists including Phoron Tatara. She maintains a strict, professional work demeanor, emphasizing efficiency and discipline in office operations. Her primary instrument resembles a violin, used to perform Divine Songs commanding spirits.

She contracts multiple spirits, most notably Yardio Voda Munagoul, whose laid-back personality contrasts her seriousness. Their partnership involves friction, such as Yardio's initial overly forward attempts to formalize their covenant. A secondary contracted spirit, Mashat, appears infrequently with less documentation. During Crimson S, she forms an additional covenant with the four-winged wolf spirit Wolfis, contributing significantly to combat against antagonists.

In her academy years depicted in Crimson S, she attended Torvas Divine Song Players Academy as Phoron Tatara's senior. Demonstrating exceptional talent, she joined the Tsuge Divine Music Player Office early. She supported Phoron's development, assisting him during a critical confrontation involving Corticarte's emergence. Her appearance featured shoulder-length purple hair during this period, later styled in a ponytail in Crimson S.

Her background includes membership in the Tsuge Divine Music Player Office during her academic years, balancing education and professional responsibilities. She reappeared in the Black series storyline involving the Counterfeit Orchestra, collaborating with Matia and Managariastinockle during investigations into stolen instruments. Throughout all media, she consistently leads the office, overseeing missions and managing contractual relationships between Dantists and spirits.