Michael "Mike" Wheeler, portrayed by Finn Wolfhard, is one of the main protagonists of Stranger Things. The leader of the Party, he is the boyfriend of Eleven, the best friend of Dustin Henderson, Lucas Sinclair, Will Byers, and Max Mayfield, and the younger brother of Nancy Wheeler.
William "Will" Byers, portrayed by Noah Schnapp, is a major character of Stranger Things. Will is the son of Lonnie and Joyce Byers and the younger brother of Jonathan Byers. He is best friends with Mike Wheeler, Lucas Sinclair, Dustin Henderson, Eleven, and Max Mayfield.
William "Billy" Hargrove, portrayed by Dacre Montgomery, is a major character of Stranger Things. He served as the tertiary antagonist of the second season and the central antagonist of the third season.
Dustin Henderson, portrayed by Gaten Matarazzo, is a main character in Stranger Things. He is the best friend of Mike Wheeler, Eleven, Lucas Sinclair, Will Byers, Max Mayfield, and Steve Harrington, and is the boyfriend of Suzie.
Jane "El" Hopper (born Jane Ives), better known as Eleven, is one of the main protagonists of Stranger Things. Her character is portrayed by Millie Bobby Brown.
Hopper was Chief of Police in the small, sleepy town of Hawkins, Indiana, where he used to live out a carefree existence - yet haunted by a troubled past.
Jonathan Byers, portrayed by Charlie Heaton, is a main character in Stranger Things. He is the oldest son of Joyce Byers, the older brother of Will Byers, the eventual boyfriend of Nancy Wheeler, and the best friend of Argyle.
Maxine "Max" Mayfield, portrayed by Sadie Sink, is a major character of the Netflix series Stranger Things. A newcomer to the Party, she is the girlfriend of Lucas Sinclair, and the best friend of Mike Wheeler, Jane "Eleven" Hopper, Dustin Henderson, and Will Byers.
Nancy Wheeler, portrayed by Natalia Dyer, is one of the main characters of Stranger Things. She is the older sister of Mike Wheeler, the former girlfriend of Steve Harrington, and the current girlfriend of Jonathan Byers.
Steve Harrington, portrayed by Joe Keery, is a major character of Stranger Things, having a recurring role in season one before being upgraded to a major role as of season 2.