Over the years, Rick and Morty has mostly focused on the two titular characters. Rick C-137 took up most of the screen-time, as a mad scientist who eventually achieves his main objective of killing Rick Prime. He repeatedly tangles up young Morty (from the Prime dimension) in his antics, forging one of pop culture's most iconic bonds. However, the show has tried to incorporate more of the supporting cast in recent seasons.
Source：https://www.cbr.com/rick-and-morty-rick-summer-relationship/
