Viper

While many criminals fight for control in Mystral only one syndicate held that control as well as the Serpent . The top agent of this organization is Mary Brass but her codename in the mob is Viper

Viper is a lightish-dark skinned snake faunus. She wore a black suit with a white undershirt and red tie as befitting a professional like herself despite how impulsive she acted

She fought hard to get to where she is and doesn't take crap from anyone much less a certain blonde who trashed two twins who are the daughters of a good client of Serpent.

An example had to be made.