The West Wing - Josiah Bartlett, Josh Lyman, Tobi Ziegler, Leo McGarry, Sam Seaborn
The Newsroom - Will McAvoy, Don Keefer, Charlie Skinner, Sloan Sabbith, Mckenzie McHale
This two shows have what are probably the best written characters in TV shows, and their dialogue is always amazing, especially Josiah has a presence around him that suits the role very well
Friends - Chandler Bing, Joey Tribbiani, Ross Gellar, Monica Gellar, Rachel Green, Phoebe Buffay
Funny and I like the relationships between them
Scrubs - JD, Perry Cox, Elliot Reid, Chris Turk, Robert Kelso
Same as with Friends
Sherlock - Sherlock and Mycroft
Sherlock because he is sherlock and Mycroft because he is very powerful, also their characters in general
House - House and Wilson
The only reason I watched it past Season 3 is their friendship
HIMYM - Marshall and Lily
Never would have watched the show it if weren't for them