Goosebumps  a staple, Halloween or not, really fun to read. I've read every single one of them. Very creative, very fun. 

Nancy Drew, iconic, a fave character. She has mysteries that are also scary, after graduating from Scooby Doo Where Are You, this was a good second step, solving mysteries has always been a source of entertainment ever since I was a kid. 

The National Bookestore in Dumaguete used to be 2 stories in Portal, I found the complete copy of Spiderwick while I was sitting by the stairs waiting for my mom to pick me up, it was my first experience with plot twists. One of my faves too. I remember splurging on it, sacrificing 2 weeks with no bacon just so I could get a copy cos it was already the complete set compiled. There are eccentric characters here that you will surely love.