Male characters sometime appear shirtless. They are little boys so it's not bad at all.

A character unexpectedly punches two characters in the face. Fairly intense.

A girl's leg is broken. Although the act is offscreen, you hear a grisly cracking sound, and see the leg contorted and purple.

A character's dismembered ear is shown twice, blood dripping from it.

Characters are seen dead in dreams with minimal blood

A character commits suicide graphically.

A dead girl covered in blood has a red flower sticking out of her chest.

Violence involves weapons (guns, swords) and physical attacks.

People are shown with flowers sticking out of their chest,

Shit and fuck are used sparingly alongside lesser profanity like bastard.

Drugs are manufactured that can kill demons.

One character's behavior gets increasingly more disturbing and psychotic as the episodes progress.

It is a horror series, but not particularly scary, but dark.

WARNING: This parents guide shows that it's not too bad, but the series is twisted, so make sure whoever is watching this understands that.