I haven't exactly picked a plot yet but I'm leaning more towards the serial killer type thing idk. Maybe ghost? But I think I figured out what personalities I wanted the boys to have:

Onew: The "dumb"/curious one who always has to walk into a room with a creepy noise
Jonghyun: The one popular kid at school who everyone thinks is cool and brave but turns out to be scared of everything
Key: The weird kid who's obsessed with magic and fantasy movie/book series (ex. Harry Potter, Narnia, Percy Jackson)
Minho: The tough one (possibly the main character)
Taemin: The all American boy next door who's still tryna figure himself out (possibly the main character)