Final answer:
Thrill killers do not necessarily target a specific victim type but select targets based on opportunity, using a weapon that fits their character and backstory, which should convince the audience of their reasons for killing. The portrayal of victims' terror must be realistic and convincing to create a compelling narrative.
Step-by-step explanation:
The victims of thrill killers often do not have a specific type, as their selection can be random and based more on opportunity rather than a set criterion. However, the weapon used by the killer may reflect their character, being either particularly creative or fitting with their backstory and psychological profile. The backstory provided for a thrill killer should offer compelling reasons for their descent into becoming deranged, which in turn convinces the audience of the plausibility behind their urge to kill.
Additionally, the depiction of the victims' terror should be realistic and convincing, with credible portrayals of screaming, fear, and other reactions to their plight. These elements together create a believable and chilling narrative, crucial for understanding the motivation and actions of a thrill killer.