There are many stereotypes in films, and particularly the slasher genre.
A prime example would be our female character 'Casey'
Our girl is conventional character that is known as a 'scream queen'
The term "scream queen" is more specifically used to refer to the "attractive young damsels-in-distress" characters that have appeared in a number of films in the horror genre.
One of the prime examples of a scream queen would be the actor Drew Barrymore playing Casey in the 1996 slasher Scream.
Scream Queens are always, young, attractive females that are represented as sexually active and because she is sexually active she must be punished (murdered). Scream Queens comply to Laura Mulveys 'Male Gaze' theory
Our male character Sam is also another common architype in horror movies The Killer—With notable exceptions, The killer in the slasher film is usually male. His identity is often, but not always, unknown and/or concealed either by a mask or by creative lighting and camera work. He is often mute and seemingly unstoppable, able to withstand stabbings, falls and shootings by his victims. His background sometimes includes a childhood trauma that explains his choice of victim, weapon and location (the killer can be made out to be pitiable or understood). Slasher villains tend to prefer hand held weapons such as knives, axes, matchetes, and chainsaws as opposed to bombs or guns. As the sub-genre developed, some argue that the real star of a slasher is the killer, not the victims or Final Girl. Throughout most of the franchises, the killer is constant. Freddy Krueger, Jason Voorhees and Michael Myers are notable examples of this phenomenon.