I don't think I've ever heard of a positive outcome when it comes to the random kid you don't talk to spontaneously invites you to a sleepover scenario. Kids are especially cruel in late elementary school & middle school, it's a recipe for disaster. As for that last story, man I had a haunted house as a kid. It was an interesting experience for sure, isolated to the attic. To tie it back to sleepovers, my friend in middle school from two houses down was where I'd do a lot of my sleepovers as a kid, always a good time. That was a sweet gig, his parents spoiled their kids. They had waterbeds, a trampoline, ridiculous stereos, all the video games, you name it. Besides the point, tying back into the haunted stuff, that kid definitely also experienced the hauntings on a few occasions when we hung out in my finished attic, since he came over quite often too. I had basically a lounge/game room up there, it was pretty awesome except for when I had the shit scared out of me randomly. On one occasion it seemed like whatever entity was trying to physically hurt me, that one freaked me out a bit more than normal.
"He had all sorts of unusual things in his room like comic books and action figures".... ....Me, looking around my room full of action figures.... Yeah, uhh..... Unusual..... 😭🤦🏻
Sounds like a pretty normal kid's room to me based on my childhood experience, maybe the OP was in a less well-off home situation where they didn't have many toys, etc.? It also seems like the other kid's a spoiled brat that clearly has issues, I'd like to think they meant the kid had way more stuff than would be considered normal. I dunno, I try to infer things about the author based on the language they chose. And ain't nothing wrong with action figures and collectibles, even as a grown ass person.
Never had creepy sleepovers, just chronic nudity and perversion…I guess that would be creepy if it were adults. Every kid in my neighborhood was a pervert…