The Breaking Bad universe has many memorable villains, with Gustavo Fring and Lalo Salamanca being the standouts. Introduced in Breaking Bad season 2, Gus quickly became culturally regarded as an iconic villain, making the show's third and forth seasons wildly thrilling television. In Better Call Saul, Lalo Salamanca was introduced late in the game, adding an exciting new element to the series. Both are excellent villains for completely different reasons, instilling fear on the world of Albuquerque crime in their own ways.
https://screenrant.com/best-breaking-bad-better-call-saul-villain-gus-lalo/