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.
Shaundi has become more focused on the Saints and her celebrity status in the years since the Saints conquered Stilwater. She has become more determined, and aggressive since the events of Saints Row 2. She now has her own TV dating show[reference?] and a new look.
Pierce has become a celebrity, appearing in an advertisement for Saints Flow, and has multiple radio commercials for Planet Saints. He is also attempting to launch a music career at the start of Saints Row: The Third[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 Johnny Gat, Shaundi and The Protagonist during a bank robbery, and sets off a silent alarm. 
Angel is a luchadore, a Mexican Wrestler, who joins the Saints after The Protagonist helps him against an attack from the Luchadores.
In his glory days, he was 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, he unmasked Angel and caused 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 against the Deckers.
While working in the FBI she came close to some sensitive information, that worried the Deckers leader Matt Miller. This caused him to worry and forge some fake situation that got her fired from the FBI.
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.
The Luchadores are one of the three Syndicate gangs in Steelport and are led by Killbane. The Luchadores are in charge of the Carver Island district, where they run a number of protection rackets, using their brawn.
The Deckers are the one of the three gangs in Steelport. They specialize in cyber-warfare and are led by Matt Miller.
They are in charge of the Stanfield district, where they own a number of businesses, including a "sinister" fence manufacturer. The gang members are British youths, wearing black clothes with neon blue stripes on them.