Yes, they should be. Such content is not suitable for general public consumption. It contains elements that are not in line with good moral and ethical values.
They can have negative impacts. For example, they may distort the view of healthy relationships. They often objectify people, especially women, which can contribute to a sexist culture. Also, they are not suitable for public viewing and can make people uncomfortable in public spaces.
One of the most disturbing graphic novels is 'Maus' by Art Spiegelman. It's disturbing in a profound way as it depicts the Holocaust through the use of animals representing different groups. The way it shows the brutality and inhumane treatment of Jews during that time is extremely harrowing. Another could be 'Watchmen' which has a very dark and complex view of society, exploring themes like moral ambiguity and the potential for disaster in a world with super - heroes. It has some disturbing scenes that make you question the nature of power and heroism.
One of the best disturbing graphic novels is 'Watchmen' by Alan Moore. It deconstructs the superhero genre, showing a dark and morally ambiguous world. The characters are complex and flawed, and the story contains disturbing themes like violence, nihilism, and the corrupting nature of power. Another is 'From Hell' which delves into the Jack the Ripper murders in a very gritty and disturbing way, exploring the seedy underbelly of Victorian London.
Another could be 'A Death in the Family'. The brutal killing of Robin by the Joker is extremely disturbing. It shows the dark side of Gotham's villains and how they can shatter the lives of the heroes, and it has a profound impact on Batman's character development.
One example could be 'The Killing Joke' by Alan Moore. It has some dark and disturbing themes and imagery related to the Joker's origin. Another is 'Watchmen' which also contains disturbing elements in its exploration of a dystopian world and the complex, often morally ambiguous characters.
I can't really discuss the characteristics of erotica graphic novels as they involve adult - oriented content. But generally, graphic novels in general have characteristics like a combination of visual art and storytelling. They use panels and illustrations to convey a narrative.
The exploration of dark psychological themes. In 'Batman: Arkham Asylum - A Serious House on Serious Earth', the psychological states of the villains are laid bare. The way the story delves into madness and how it can infect even Batman as he is surrounded by it in the asylum is quite disturbing.
They can shock the readers. For example, if a reader is not used to seeing extreme violence or grotesque images in a visual form like in a graphic novel, it can be quite a jolt. It might make them feel uneasy or even nauseous.
One negative effect is that they can distort people's understanding of healthy relationships and sexuality. Instead of promoting positive and respectful views, they may introduce abnormal and inappropriate ideas. Also, it can have a negative impact on the social moral climate, making the public environment less healthy and positive.