The quality of TV shows often relies on main characters, but there have been many notable side characters that are not only fantastic but also ended up changing their respective series for the better.

Television history is full of side characters who walked through the door one day and walked out with the show by the end. Sitcoms can get dominated by these types of characters — the Steve Urkel ...

While most anime let the protagonists enjoy the limelight, others create a side character who can immediately overshadow the main character. The best side characters not only steal the screen time but ...