Your question is wholly inaccurate. Every show builds character development on previous episodes. Can individual episodes be viewed without understanding character dynamics from previous episodes? That depends on the episode you are watching! Cheers, The Big Bang Theory, Friends and Seinfeld all have independent episodes but watching most "series" expect an understanding of the characters that won't always be re-explained.
To be clear, The Blacklist regularly introduces episodes with "previously," so while you may not need the pilot to understand, you need previous episodes to understand some dynamics. Regardless if you know those previous episodes, each episode does stand up individually...so far.