During her first introduction, Sayaka's most noticeable traits are her obsessive attachment to Yukina Himeragi and a severe case of Androphobia, or the fear of men (which does not seem to originate from mistreatment but rather from plain hatred). This paints Sayaka as an overprotective, confrontational individual. However, on the inside, Sayaka is actually kind and gentle to those she holds close to her, if not slightly cynical towards her current situation. 

Sayaka, like most of the other characters, is a very powerful fighter and thus she has extreme confidence in her skills as a War Dancer. This confidence, coupled with her natural fighting ability, her sword (The Lustrous Scale/Koukarin), and aggressive fighting style makes Sayaka a force to be reckoned with much like (and most likely surpassing) Yukina, Gelda, and other attack mages.