<Li> Robyn Coffin as Cindy Herrmann: Wife of Christopher Herrmann, and mother of their five children (4 boys and 1 girl). At the beginning of the series, she and Christopher have just lost their home to foreclosure and together with their children move in with her parents . After watching Christopher get in over his head with various side jobs in order to get them back into a house of their own, the last of which being a rather unsavory limo service, she tells him that it isn't worth it if it means that much trouble . She then suggests they look into renting a home, and tells him about a complex where one of her co-workers lives where she heard there is a vacancy . "We'll make it our dream home ." She tells him . In the episode "Under the Knife" Herrmann announces that Cindy is pregnant with their fifth child . In "Ambition" she has a medical episode as a result of the pregnancy and passes out and is rushed to the hospital . In "Hell of a Ride" she has a baby boy via an emergency C - Section . As she is Catholic and does not use birth control because of religious restrictions, Herrmann surprises her on their twentieth anniversary by getting a vasectomy . </Li> <Li> William Smillie as Kevin Hadley: a former member of Squad 3, he was transferred out of Squad 3 to another house because of an inappropriate prank on Peter Mills . In season 2 he targets Firehouse 51 and personally targets Severide for revenge with arson attacks and burns himself when pouring gas on himself and standing on top of an accelerant, leaving him badly scarred and in constant pain . He is currently in prison . </Li> <Li> Edwin Hodge as Rick Newhouse of Squad 3: he transfers from the fictional Squad 6 based in South Side in the season 2 episode "One More Shot" to fill the empty spot left behind after Clarke's promotion and subsequent transfer . His experience and charismatic personality quickly wins over Severide and the rest of the men, although Herrmann initially antagonized him as he had yet to come to terms with the recent suicide of Candidate Rebecca Jones . When off duty, he moonlights as a skiptracer and has been seen entertaining his coworkers with stories of his "clientele". Mills looks up to him as an older brother figure . He hails from the crime - ridden Chicago area of Roseland and, despite getting out, still goes back to visit family . He is a single father with an elementary school - age daughter Naomi . In season 3, he leaves Chicago to visit family in Miami and Scott Rice takes over his spot on Squad 3 on a temporary basis . Whether or not Newhouse will return remains ambiguous . </Li> <Li> Pouch the dog: Peter is given a dog by a child from a family who could not take care of it . Hermann, Chief Boden, and Mouch decide against it . Eventually, the three agree after Hermann suggests the three should rethink the dog . She is given a name and adopted by the team . Pouch's name was decided by Hermann, who suggests she should be named after Mouch, which is half man, half couch, to Pouch: half pooch, half couch . Mouch was initially against them adopting Pouch because of a bad experience he had with the dog at his former firehouse but comes to enjoy Pouch's company . The two are often seen on the couch together . </Li>

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