Throughout the beginning 4 seasons, it was pretty mild, some scary stuff do happen but nothing serious. However, from season 5 and onward, the intensity in the scares and unnerving scenes that lean into both the paranormal side and the murder and torturous side increase exponentially as time goes on. It would not be ideal to show anyone that has a problem with those certain types of scenes.
To whoever is afraid of the paranormal, is cristian, loves God and believes in it, is afraid of dark magic, curses and satanism, stay away! This show contains a lot of dark scenes that contain references to satanism, vampires, dark magic, malevolent spirits, disbelief in religion and god itself, social crisis of life and it's meaning, depression and even torture and prostitution. It is not ideal for audiences under 18+.
If you watch the show from beginning to end, (including the spin-offs), the story you form begins to make sense and what you figure out is a tale that you will wish to keep for the rest of your life. At that, a traumatic and life changing one.
Certain scenes show the team in peril and fighting against real and dangerous situations.
The re-telling of history, showcase of violent murder and torture, prostitution, satanism and depression in some episodes may and IS VERY unstable for MOST audiences.
In the Urban era, the feeling of peril and danger is high and unstable in certain episodes. As they can contain police chases and hideouts, a feeling of loneliness and sadness or maybe, guilt.
Season 5 to 8 include very dark, serious and realistic depictions of depression, a feeling of wasted potential, a tale that features peril, darkness and fear in all corners and a tale to tell all it's tales of true horror beauty.
In conclusion: Whoever is afraid, squeamish or alerted by presences of dark imagery, disturbing history, peril, police chases, a way too real depiction of danger, sadness and midlife crisis, disbelief in god and religion, satanism, war and the paranormal in itself, it is not recommended to experience a single amount of this show, as it is one of and if not the darkest and most horrifying piece of TV media in the world.