Common Sense Note
Parents need to know that the dangerous world these characters inhabit contains regular violence (including sexual violence) that nets dead bodies and bloody crime scenes. You'll also hear some low-level swearing (think "damn" and "hell") and see scenes in which sex is implied (but no sensitive body parts are shown). There's social drinking, too, along with occasional use of name brands like Prada and Viagra.
Occasional kissing and implied sex, but no sensitive body parts shown.
Characters use guns and other types of weapons. Physical violence. Crime scenes also contain a good deal of blood, stemming from shootings, stabbings, etc. Some crimes are sexual in nature, involving rape, prostitution, molestation.
Occasional use of words like "hell" and "damn."
Justice wins out -- just barely -- in a world where violent crime is commonplace. There's also a recognition that special abilities can and should be used to help others.
Rare name-dropping, like Prada.
Drugs / Tobacco /
Social drinking, with occasional mentions of prescription drugs like Prevacid and Viagra.