The 99th Precinct's strict new Commanding Officer. The Nine-Nine is Holt's first command despite many years of outstanding service, something he attributes to prejudice against him being gay. He has a husband, whose name is Kevin.
The detective squad's leader. He previously worked with Holt at another precinct where he was overweight and was given the nickname "Terry Titties". A year prior to the show's beginning, following the birth of twin baby girls named Cagney and Lacey, a reference to the classic police procedural show Cagney & Lacey, he suffered a breakdown of sorts where he "lost his edge" and any desire to work in the field due to a fear of losing his life and leaving his children without a father.
Detective Amy Santiago
Jake's uptight and overachieving partner. She is continually trying to ingratiate herself with Captain Holt.
Detective Charles Boyle
Joe Lo Truglio
A nervous, clumsy but honest and hard-working detective who has a crush on Detective Diaz. He is divorced from his wife, who had numerous affairs during their marriage.
Administrator Gina Linetti
The 99th Precinct's sardonic civilian administrator.