A.N. — A bit of humor here to enliven a droll workplace. As nothing is known about today's character other than a name, occupation, and whereabouts for a chunk of time, I elaborated using a more known person.
320. Savage
During their posting at Hogsmeade to guard Hogwarts, Tonks enjoyed nothing more than riling Savage up while stuck with him on duty.
Savage was a grade-A jerk, so Tonks took every opportunity to give him a hard time. Whether it was morphing into her cousin to goad him into chasing a false Sirius Black sighting, or changing the assignment board around so he'd be on overnight shifts, Tonks' main (unofficial) mission was to savage Savage.
Her senior partner knew ratting Tonks out to their superiors would make him look incompetent and weak. So, Savage settled for harassing Tonks in turn.