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Marked because: This article currently reads like a list. Each character should have a link to their main article and a short summary/paragraph of their role in the game, similar to the Characters in Saints Row 2 article.
Johnny Gat is second in command of the Saints and is the earlier member of the Saints who is still in the gang. After the bank heist that goes awry, the gang is taken hostage by the Syndicate. Johnny escapes and frees the Protagonist and Shaundi, before attempting to take control of the plane.
Pierce has become a celebrity, appearing in an advertisement for Saints Flow, and has multiple radio commercials fro Planet Saints. As well, he is attempting to launch a music career at the point when the events of this game kick off.[reference?]
Josh Birk is a model and actor, who is working with the 3rd Street Saints as research for the upcoming Saints movie in which he stars as a Saint. Josh Birk accompanies the Johnny Gat, Shaundi and The Protagonist during a bank robbery, and sets off a silent alarm. 
In his glory days, he was once a Killbane's tag-team partner. Soon after, they formed a gang in Steelport called The Luchadores, made up of mexican masked wrestlers. As the gang grew larger, Killbane became angry and jealous of Angel's respect in the gang, therefore causing him to unmask Angel and cause him the greatest shame a Luchador can feel. 
Kinzie Kensington is a former FBI agent who joined the 3rd Street Saints after The Protagonist frees her from the Deckers. Thanks to her hacking knowledge, she is very useful to the Saints in their fight with the Deckers.
Zimos is Steelport's oldest pimp[reference?] with an autotuned voicebox. His connections with Steelports underground sex trafficking proves useful to the Saints.[when?] He joins the Saints after The Protagonist saves him from the Morningstar.