I.e. people not Sherlock Holmes or Joan Watson. One of the reasons why I like Elementary is that by and large, it has a deep respect for its characters. Which isn't the same as taking them too seriously, by the way. Every one of us has their absurd moments, and often fictional characters who never have them are lacking some bit of fictional life, of three dimensionality. No, what I mean is that while of course the Elementary characters, with the exception of Joan, who is the co-lead, are supporting characters, which means they get less sceen time than the leads, and their stories aren't the driving story of the show, they nonetheless are written and played in a way that allows us to see they have a life outside of when it intermingles with the one of Sherlock Holmes, they have opinions and emotions that aren't about him (either positive or negative), and when they share a scene with him, the emotional weight of the scene isn't automatically given to Holmes.
( Spoiler cut to protect Elementary newbies )
( Spoiler cut to protect Elementary newbies )