I remember someone telling me that Stranger Things is about redemption, however, not every character got a redemption arc and I can name a few who did not.
Tommy Hagan
Carol Perkins
Agent Connie Frazier
Larry Kline
Grigori
Tom Holloway
Bruce Lowe
Ozerov
The scumbag and sleaze (Hargrove and Byers, beyond redemption)
Lt. Col. Jackass Sullivan (way beyond redemption, although he may appear S5)
Warden Melnikov (way beyond redemption)
Jason Carver
Yes, Vecna himself was also offered the chance, but he dropped the ball on it.
After season 4, I feel like everyone forgot about Grigori. But he killed one of the most fan favorite characters ever, one of the show's icons; Alexei. He's the main reason Hopper was stuck in Russia for the entirety of season 4. He's a ruthless and despicable man whose profession is killing; he's completely robotic and emotionless. To me, he's worse than Sullivan, Brenner, Connie Frazier and Angela combined.
Next, Tom Holloway and Bruce Lowe. To me, these two were strangely compelling characters. Bruce had an infuriating personality, and Tom had an interesting balance and internal struggle; he seemed to switch personalities between his work at the Hawkins Post and with his wife and daughter.
Finally, the Flayed as a whole. I cannot tell you how effective this concept was. The Mind Flayer mass-possessing was just phenomenal, I shouldn't even have to explain.
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Why are they not even mentioned in season 4? Starcourt Mall is where everything happened, Grigori is basically the reason Hopper was in Russia, and Murray had such a great bond with Alexei.
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Just talk about how gruesome recurring characters deaths in season 3 were?
Heres an example
Doris Driscoll: Melted down into a pile of gore
Grigori: Ripped into nothing by machine