Was a main cast member in Seasons 1-2
Adriana La Cerva: Christopher's Girlfriend
Became full-fledged cast member in Season 2 (extra, guest in Season 1)
Janice: Tony's Sister
Joined and became full-fledged cast member in Season 2
Livia: Tony's Mother/Nemesis
Was the celebrity main cast member in Seasons 1-2; character died of a stroke after the actress died for real in 2000
Joey Pants: Tony's Capo/New Nemesis
Was the celebrity main cast member in Seasons 3-4; joined in Season 3
Richie Aprile: Tony's Capo/2nd Nemesis
Joined as a full-fledged cast member in Season 2, and left before that same season ended
Bobby Bacala: Uncle Junior's sidekick
Became a regular in Season 3; joined in Season 2 (guest)
Furio: Tony's soldier from Naples
Became a regular in Season 3; joined in Season 2 (guest)
Artie: Tony's lifetime friend
Became a regular in Season 3; joined in Season 1 (extra, guest in Season 1)
Charmaine: Artie's wife
Became a regular in Season 3; joined in Season 1 (extra, guest in Season 1)
Thin Guy: Tony's Soldier/Third to Joey
Joined and became regular in Season 3
Johnny Sack: Tony's friend from N.Y.
Became a regular in Season 4; joined in Season 1 (extra, guest in Season 1)