Jim Hopper is one of the main characters in the Netflix original series Stranger Things 

He is the police chief of the city of Hawkins in Indiana, USA. He is played by David Harbor

Jim lived in a big city with his wife Diane  

where he worked as a police officer. Together they had a daughter, Sara , who died of cancer at a very young age. 

After their daughter's death, Jim and Diane divorced.  

Hopper and Mike are the only 2 characters to appear in every episode.

Surprisingly, the revelation that Hopper is alive comes in the first episode. Joyce gets a cryptic letter (inside a Russian doll, no less) that he’s still alive.  

Eleven : The girl he raised by spending a month after finding Will, at the end of the second season she becomes his adopted daughter.