Stranger Things has done a great job of developing its characters, and quite a few of them are portrayed as having a mix of good and bad qualities. Dustin's a lovable goofball, but he's not above covering up for an otherworldly pet who turns out to be more hostile than he expects. And who doesn't love Season 2 Steve, now that he's matured from the complete douchebag he was at the start of the series?
So these are the characters that seem to have more bad than good in them. Let's see how they rank (spoilers ahead):
10. The Demogorgon
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Yes, the rampaging monster from the first season is barely on the list, even though it probably killed Nancy's best friend and sparked all those #JusticeForBarb posts. Because when it comes down to it, the Demogorgon is just some creature from an alternate dimension who wound up doing what it always does, just in our world. There was recently a giant uproar in my city because a coyote wandered out of the woods and snacked on a few small dogs; no one really blamed the coyote for doing this, everyone was just advised to not let their highly edible toy dogs run free. I kind of see the Demogorgon as having a similar nature.
9. Dart
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Dart is kind of a similar case. You could even argue that he's not as bad as the Demogorgon. After all, he's fairly harmless when he's a tadpole, and Dustin managed to tame him enough that he opts not to harm him and the others later in the film. You may even feel a little sorry for him when he dies.
On the other hand, I'm a cat person and Dart rather brutally kills Mews, Dustin's cat. Not cool, Dart.
8. Troy's weasel friend
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He has a name? Fine. James.
James is your typical middle school jerk who likes to pick on others, which in Stranger Things includes Mike, Dustin, Will, and Lucas. He basically serves as the backup and reinforcement for Troy's nastier brand of bullying, but shows at least some moral compass when he protests Troy's demand that Mike jump off a cliff. He's perfectly fine with Troy threatening to carve Dustin's teeth out of his head, though. Reign in those boundaries a little more, James.
7. Billy Hargrove
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I originally had Billy, Max's jerkwad stepbrother, set much higher on the list. His character acts like someone turned his persona to "Asshole" and then broke the dial off. He's cocky, domineering, and abusive. There are times when he's disturbingly violent, such as when he nearly runs down Mike and friends with his car and when he gleefully beats Steve unconscious.
I'm cutting him a bit of slack, though, since one scene suggests that some of his personality stems from his father's mistreatment. There's also the possibility that nearly getting castrated by a nail-studded baseball bat will humble him a bit in the third season.
6. Troy's mom
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We only see Troy's mother once, when she makes a ruckus at the Hawkins Police Department about how they need to find the girl who broke her son's arm. Troy probably changed the story from "This girl attacked me with her mind when I tried to murder a kid" to some blubbering lie that bullies like to tell when their victims fight back, but her demeanor suggests that she's been taken in by the misconception that her jerk son is a perfect angel for way too long. Stop your enabling, Mom.
5. Dr. Martin Brenner
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On the one hand, he's an evil mad scientist whose crimes have included abducting and experimenting on a child, unleashing hellish creatures from an alternate dimension on an unsuspecting small town, and generally being a pretty unscrupulous and shady guy.
On the other hand, he managed to give Eleven telekinetic powers and she seems perfectly happy with those. Wouldn't you want telekinetic powers?
4. Troy
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Why is Troy ranked higher than the mad doctor and a couple of literal monsters? Because screw bullies, that's why. He starts off as the kind of jerk who throws a few insults and taunts around, which is shitty but something bullies tend to grow out of once they get a little more mature.
But when you ruthlessly mock a classmate after he's been declared dead, threaten in all seriousness to remove someone's teeth with a knife, and demand that one of your bullying victims take a suicidal leap into a quarry, you're firmly in sociopath territory. Troy doesn't show up in Season 2, probably because his parents finally found his collection of tortured squirrels and sent him off to get electroshock therapy.
3. Connie Frazier
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Benny, the owner of a Hawkins diner, is an instantly likable character. He's angered when he sees Eleven sneaking some food out of his kitchen, but immediately grows kinder when he realizes that she's apparently escaped from a bad situation.
So it's pretty shocking and saddening when Benny's attempt to get Eleven help ends up getting him murdered by Connie Frazier, who poses as a social services worker and before abruptly shooting him. She later manages to manipulate the boys' biology teacher in her hunt for Eleven, and you're left worrying that the teacher won't make it out alive, either. Frazier is cold, manipulative, and dangerous, so it's pretty satisfying when Eleven telekinetically takes her out.
2. The Mind Flayer
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I've given the other creatures from the Upside Down a bit of a pass, since they kind of come off as dumb animals. The Mind Flayer is something else entirely, acting as a sort of hive mind who can control the other creatures and infect people to use for its own purposes, which would seem to entail taking over our world. Yeah, the giant smoke spider is pretty bad. But it's still outdone by...
1. Stacey
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We see Stacey in one scene, at the very end of the second season, in which she rudely turns down Dustin's request to dance. Everyone loves Dustin, so I don't have much patience for someone whose actions (combined with some similarly hostile girls, admittedly) leave him fighting back tears on the bleachers. Especially when that person is so very full of herself.
Stacey, you're worse than the bullies, evil government agents, and monsters from another realm we meet in the show. Think about that while you're on the long, steady downward slope from your peak in middle school.