Steddie

Steveddie is the slash ship between Steve Harrington and Eddie Munson from the Stranger Things fandom.

Vecna's Curse
While looking for Eddie at Rick's place, Max finds a large storage shed out back. She, Steve, Robin and Dustin then head inside and start calling for Eddie. Steve assumes that he might be hiding under a tarp and starts poking it with an oar, which Dustin makes fun of him for. Steve points out that everyone in the room has nearly died before and he's not taking any chances, when Eddie pops out and pushes Steve up against a wall. He hold a knife to his throat and Dustin immediately tries to defuse the situation. He does so and Eddie removes the knife from Steve's throat letting him go.

The Massacre at Hawkins Lab
As the group walks through the woods, Steve walks up to Eddie and tells him that he just wants to thank him for saving him. Eddie says that Steve saved himself and that he pulled a real Ozzy back there. Steve is confused till Eddie explains that he's referring to the time Ozzy Osbourne bit a bat's head off onstage. Steve still doesn't know what he's referring to, but Eddie just says that what Steve did was pretty metal and Steve awkwardly thanks him. Eddie says that Dustin insisted that Steve was a badass and Steve is surprised he did so. Eddie says that the kid worships Steve, it's kinda annoying. He doesn't know why he cares what Dustin thinks, but he did get a little jealous. Just couldn't accept the fact that the Steve Harrington the guy with a perfect life, was a good guy. He gets up in Steve's face and jokingly says he's still jealous, making Steve laugh a bit. But all that was why he would have never jumped in the lake to save him. Outside of DnD, he'd just run at the sight of danger. Which is what he's learned this week, but Steve tells him to give himself a break. Eddie says that it was the girls who went in first, and he wouldn't have gone in if they hadn't first. He tells Steve to try and get Nancy back when they're interrupted by the Upside Down shaking.

The Hellfire Club

 * Steve passes on hanging with the Kids and Eddie "The Freak" Munson, which makes Dustin accuse Steve of being jealous of him having another older male friend, much to Steve's disgust.

Vecna's Curse

 * Steve makes a comment on how Eddie is Dustin's new best friend because he plays DnD with him.
 * Dustin tells Steve that he should be spending less time looking for a girlfriend and more time looking for Eddie.

The Monster and The Superhero

 * Steve gives Eddie a small wave when the group arrives.
 * Steve gives Eddie a nod and tells him about Eleven.

The Dive

 * Steve says that with the pack of beer they bought Eddie can at least drink himself into feeling better.
 * Eddie agrees with Steve's assessment of Dustin, and they share a nod.
 * Steve starts to explain El, when Eddie points out that he already did so.
 * Eddie asks if Dustin is cursed, and Steve tells him that he's not, just mental.
 * Steve says that they can't just go hiking through the woods since Eddie's still wanted.
 * Steve tells Eddie to grab his stuff.
 * Steve tells Eddie to take it easy with the boat.
 * Eddie has no complaints when Steve says he'll be swimming to the bottom of the lake.
 * Eddie hands Steve a flashlight and wishes him good luck.
 * Eddie freaks out when Steve resurfaces.
 * Eddie dives into help Steve after Nancy and Robin.

The Massacre at Hawkins Lab

 * Eddie helps take out the bats that are attacking Steve.
 * Steve explains to Eddie how all the vines are connected to the creatures.
 * Eddie throws a shirtless Steve his vest "for modesty".
 * Steve gives Eddie an annoyed look when he yells "hi" at the light spot.
 * Steve and Eddie both agree that Dustin needs to get his ego in check.

Fanon
Steveddie quickly gained a following once Season 4 of Stranger Things came out. Although it took till a little later in the season given that Eddie was introduced in episode one, but didn't have any major interactions with Steve till the end of the season. Many fans have also joked that Steve and Eddie are co-parenting Dustin, or are fighting over who's the favorite parent.

On AO3, Steveddie is the most written ship for Eddie and the ninth most written for Steve. There are currently 133 works and is one of the fastest growing number of fics since season 4.

Fandom
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Trivia

 * When twitter user @kelexyn tweeted out "Thank God Steve Harrington finally got a co-parent in Robin because really, eight kids and a new boyfriend is a lot for a single mother to juggle..." the official Stranger Things Quote retweeted it, the boyfriend referring to Eddie.