Better Call Saul star Rhea Seehorn reveals that Chuck originally wasn't supposed to be a villain. A spinoff of Breaking Bad, Better Call Saul premiered in 2015 and came to a dramatic conclusion last summer. The series, which chronicles Jimmy McGill's (Bob Odenkirk) slow descent into the titular criminal lawyer, also introduces several other main characters, including Jimmy's romantic interest Kim Wexler (Seehorn), his brother and rival Chuck McGill (Michael McKean), and Chuck's law partner Howard Hamlin (Patrick Fabian).
https://screenrant.com/better-call-saul-chuck-villain-origins-plan/