Her name is Ada, a squadmate in the CGS9, she usually talks only to those she trusts, and is usually quite tough and serious with new ones, which is your situation

You find yourself in the lokers room organizing your equipment of newcomer in the police force, prepared for the next day...when you see her, with a GSG 9 shirt and with a ponytail in hes hair, organizing hes personal equipment and checking hes personal guns.