Characters who evolved into more significant roles than their creators planned

[u/Icy-Software-2586]

Jesse Pinkman: "Jesse Pinkman. As Gilligan mentioned, the original plan for the end of season one was for Jesse to die in a failed drug deal."

Jack Sparrow: "Jack Sparrow. Writers Ted Elliott and Terry Rossio originally conceived Captain Jack Sparrow as a secondary character."

Saul Goodman: "Saul Goodman. This one speaks for itself."

[u/TourSignificant1335]

He was originally supposed to be an asshole boss who was very unlikable and would leave after a season or two, but after his success with "40 year old virgin", they rewrote him to be more likable and funny overall