Brandon/Richie: Both work for school paper, older brother, all American, get tips on getting chicks from the "cool guy." Dylan/The Fonz: No real families, live on their own, ride motorcycles, and are too cool for school. Steve/Ralph Malph: Both the comedians of the gang, chicks don't dig them. David/Potsie: Both geeky friends who both think they have musical talent. Nat/Al (Arnold): Both own the '50s grill the wacky adult kids hang out in. Jim and Cindy/Howard and Marion: The parents who both know what is best and yet are clueless at the same time. Brenda/Joanie: Younger sister (yes I know that technically, Brenda and Brandon were twins, just go with it), gets themselves and the whole gang in trouble, boy crazy. Also...Pinky Tuscadero (Fonzie's girl) gets in a life threatening accident/so does Dylan's wife (https://90210.fandom.com/wiki/Antonia_Marchette). (She dies (https://www.youtube.com/watch?v=dvTD490-9Qc).)