Shirley is one of the side protagonist in the Shadows House series and the Shadow living under the care of the Living Face, Rum. Due to the fact that Rum barely spends any time with her Master, we don't get to see Shirley's personality much. The best way she could be described would be as quiet and shy, like her Face.
Shadows House
Faceless shadow nobles living in a vast mansion, attended by living dolls who spend much of their time cleaning up the soot endlessly emitted by their mysterious masters. Follow the story of Emilyko, a young and cheerful living doll, as she learns her duties serving as the attendant for Kate Shadow-sama.