As Flugel's apprentice, Shaula is absolutely loyal to Flugel and has never refused him once.
As Shaula is horrible at telling people apart, she refers to people based on smell alone. Due to Subaru apparently having Flugel's scent, she often calls him sensei.
During Meili's stay at the Pleiades Watchtower, Meili becomes attached to Shaula, who she refers to as "naked onee-san". Typically, she spends her time hanging onto Shaula's shoulder.