Characters kiss and cuddle.

A lot of teenage flirting. There are love triangles, and lots of talk about dating, and romantic couples. Some female characters wear clothing that is low-cut or exposes the midriff.

Frequent fighting. Characters get hurt. Some fights get very intense. However, injury detail is rarely seen.

Mild insults and name-calling.

Implied in the beginning of the second season at a party with adults holding glasses of an unknown beverage. Possibly wine or champagne.

Season 4 deals extensively with the trauma of a main character, who is strongly hinted to have PTSD. The flashbacks this character has include getting attacked by a ghost-like figure and drowning; these flashbacks can be disturbing and frightening to viewers.

There are multiple scenes throughout the show that can be considered very intense and frightening in nature.

The series includes themes such as social unrest, civil war, terrorism, anarchism, murder, and suicide.

This show deals with very serious themes and occasionally depicts somewhat intense acts of violence.