These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Angst? What Angst?: Billy Deep from the "Deep Trouble" series always seems to get his cocky attitude and thirst for adventure back, even after surviving dangerous incidents with sea monsters, sharks, and criminals.
Canon Sue: In the TV version of You Can't Scare Me, Courtney comes off as this.
The villainous dummy Slappy. Whenever a person finds him and reads a piece of paper that has the spell to bring him to life, Slappy always tries to turn the person's family against them by framing them. But that's not all. He would try to make the family his slaves, which normally involves preteen girls. In one book in particular, the protagonist in the book throws a birthday party in the basement, and Slappy sprung to life and grabbed the birthday boy by the neck. He then threatened to kill everyone in the basement if he didn't receive a bride. The doll, Mary Ellen, offers herself as his wife, but he turns her down and was referring that the protagonist, who is a preteen girl be his bride. When she refused, he punches her, and states that it was only a love tap. In the book Slappy's Nightmare, Slappy is forced by his ventriloquist to act good or face certain death. When Slappy felt that Georgia was picking up on him, he pondered on whether or not to kill her and her family in order to avoid being caught. Slappy then ups this in the Goosebumps Horrorland book entitled Slappy New Year in which he tried to cut a boy's head off with garden shears.
There's also the Big Bad of Goosebumps Horrorland, the Menace. When he was completely alive, kids died on his rides but he didn't care, due to his experiments in fear. The park was so scary, it somehow ended up in an alternate universe. Later, he found out Horrorland was made on his park, so he got contact with a horror to invite guests there so he get them to panic park, and make them bring the fear meter up so he can PP back to the normal world. it's implied he's done this before...but the previous kids got so scared they died and he simply doesn't care. He even got several other goosebumps villains to follow him, including Slappy, and King Tutten-Ra from another GBH book. However, this could also be a case of Blue and Orange Morality, since the Horrors had their own set of morals.
Mr. Toggle from Piano Lessons Can Be Murder is a self-described brilliant robotician who runs a piano school that Jerry is sent to by his parents. When Dr. Shreek was trying to get Jerry's, our protagonist's, hands, Mr. Toggle comes and rescues the boy. However, Mr. Toggle turns out to be the one who wants Jerry's hands. Despite his status as a famed robotician, he couldn't make robotic hands properly. So, he lures young children to his piano school and cuts their hands off and uses them for his experiments in hopes of creating beautiful music. When Jerry tries to leave the school, he is confronted by the ghost girl again, and she reveals that her hands were also taken from her. Toggle is then taken into the forests by the vengeful spirits of the deceased children that he killed and is never heard from again.
Karl from "Chillogy", who gets sick pleasure out of physically and mentally torturing kids simply because it's his hobby. He transports them into his miniature town and personal playground Karlsville, where he toys with them before he plans to kill them. He manipulates Jessica into pursuing her own greed to sell more of his lemonade, then turns her into a pig and sends a mob of angry townspeople after her to serve her up to him for lunch. He plays a lethal game of baseball with Matthew where Matthew has to do such things as fight a team of monsters, dodge killer baseballs, and crawl over a lava pit to make it to the next base. His last victim is Matthew's brother Todd, whom he prepares to 'make a citizen of Karlsville' by turning him into a small plastic figure who will be forever conscious. He delays Todd's fate as long as he possibly can to enjoy Todd's fear.
Gender-Blender Name: Dana, the male protagonist of "Egg Monsters from Mars" (though that was probably done as a censorship measure, given the ending of that book. It...was still Squicky no matter how you slice it).
Harsher in Hindsight: A lot of the stories centered on kids being made fun of and wanting revenge, fearing for their lives at school (or children dying or said to be dead) are more depressing to read in this post-Columbine/Virginia Tech/Newtown world.
Mr. Wood crosses it in the first Night of the Living Dummy when he threatens to kill the family dog.
Alexander betraying the Deep family and allowing them to be murdered, all out of Greed and fearfor his own life.
Again, Chicken Chicken: The entire book is Vanessa's.
Tastes Like Diabetes: A Holly Jolly Holiday, about a disgustingly sweet Christmas movie available on a cursed video cassette that brainwashes a family into acting as cheery as its main character, Susie Snowflake (until the main character turns on a wrestling match while rewinding the tape and the family snaps out of it).
They Wasted a Perfectly Good Plot: When Horrorland was launched it included reprints of classic Goosebumps stories as companions, although some of the accompanying reprints don't really match up with the Horrorland books. The original Horrorland story was reprinted alongside Dr. Maniac Vs. Robby Schwartz, even though Attack of the Mutant seemed like a more natural choice. Weirdo Halloween received The Scarecrow Walks At Midnight instead of Attack of the Jack-O'-Lanterns which was also a book about kids dealing with aliens on Halloween.
Chicken Chicken, again. Considering the entire story involve two kids going through a horrible humiliating transformation into a chicken, simply because they forgot to say "I'm sorry." Troy Steele made the uncomfortable parallel to a small child being beaten by a parent for not showing them respect. Since Vanessa got zero comeuppance for what she did, it appeared as though the book was saying the kids deserved it.
The sheer amount of negative British stereotypes in the TV adaptation of "A Night in Terror Tower". In the book, the security guard helps the children find a cab - in the episode he refuses to believe their story, yells at them and threatens to call the police. The cabbie himself has bad teeth and behaves rudely for no reason. The receptionist at the hotel is condescending and snobby. The waiter in the restaurant is also snobby and rude. And we also get a pompous old lady who has an insanely over-the-top reaction to getting pie in the face.
Wangst: There's quite a bit, considering it's an adult writing through the viewpoint of twelve year olds, but Sarah from Curse of Camp Cold Lake really stands out.
The Woobie: Carly Beth Caldwell, especially in the TV show, and especially Crystal and Cole.