The 6 missing kids, Charlie/Charlotte, Cassidy, Jeremy, Fritz, Gabriel, and Susie are all dead kids, being ghost or souls kinda with a more kid form

Jeremy: "stop Fritz! " Jeremy said to Fritz a little annoyed

Fritz: "haha got ya Jeremy! "

Gabriel: "hey Susie wanna draw? "

Susie: "oh alright! "

Charlie: "why are they so annoying.. "

Cassidy: "your ALL annoying! "

they all got along but fought like siblings at times, being about 6 to 9 years old, and each had unique personalities