Things I've just noticed by the way!
The IT movies and book are my favourite things EVER. Also the Duffer Bros. admitted to having taken inspiration from It. So I'll go into it!
(PS- some details are from the book so dw if you're confused)
Spoilers for IT!!!!
Part 1: Characters
1) ST: Mike being the 'heart'/ IT: Bill being 'Big Bill'.
Mike, the leader is described as the 'heart', who is the person who brings the Party all together. This is a very subtle reference to Bill being the leader and core of the Losers, the most charismatic and the one who fuels them. Of course though, as of season 4, Mike is nothing like Bill (my personal pookie bear)
2) ST: Will's disappearance/ IT:Georgie's death.
Will's disappearance is the get-go of all the series. It uncovers the upside down and all the monsters, and how the Upside-down is how it is today. The same is in It, because when Georgie dies, Bill wants to get revenge and kill what killed his brother. This uncovers that Pennywise is not just a clown but a much more complex being.
3) ST: El entering the group/ IT: Mike entering the Losers' Club.
When they find El in the woods, the four OG party members sort of 'rescue' her from the 'bad men' and bring her in to the group, just like when the Losers engage in a rock fight with the bullies (who are like Troy and James x10) and save and introduce Mike Hanlon to the Club.
4) ST: Max/IT: Bev
Max is the tomboy redhead in Stranger Things. She's sassy, sarcastic and resourceful. She also deals with abuse at home, but finally stands up to it, even though it never leaves her. Just like Beverly, who's smart, fiery and brave. She deals with sexual abuse from her father and she stands up to it before he can rape her. But it never leaves her and she ends up marrying an abusive man. Max is definitely based off of Beverly.
5) ST: Will/IT: Eddie.
Will is the weakest of the group, like emotionally. He is still very childlike at 15 because his childhood was taken from him by the Upside-Down. Eddie is also the weakest, but because he has a mother with Munchausen Syndrome by Proxy and she's also an overbearing bitch. Joyce is much better she is a QUEEN
6) ST: El's powers/ IT: Bill's shine.
El has powers, obviously. It's made very CLEAR. All the Losers have a shine, but Bill the most: he can sense when the Apocalyptic Rockfight will happen. It is also like Will's upside-down sensing -- but more on that later.
7) ST: Will's Upside-Down connection/IT: Richie is the seer
Will is connected to the Upside-down with the sensing abilities. But one of the Losers, Richie was able to see It's arrival. He is severely nearsighted, so it makes sense that he can see things with his mind and not his real eyes.
8) Comedic Relief
Richie is the comedic relief in IT; in his own words, he was a "vulgar, sometimes amusing comedian'. The comedic relief from the party is from all of them, but mainly Dustin, Lucas and Max. Dustin is also a nerd, like Richie, and Max is a gamer, like Richie.
9: Bullying - Ben and Dustin, Mike H and Lucas
Ben and Dustin are both bullied for physical features -- Dustin has Cleidocranial Dysplasia (CCD) and Ben is overweight. This earns them cruel names: Toothless and Tits, respectively. But as for Lucas and Mike H, there is racism. Mike H gets it more, being actively called the n-slur, but Lucas being called Midnight is extremely racist. Also Billy is racist to him, but not in a very active way, mostly.
10) Bullies
Here's a link because I can't be arsed to write it out.
What do you think? Let me know in the comments!