If you are writing a literal killer or a high-stakes antagonist, they must feel authentic.
A killer first sentence is a handshake that refuses to let go. Killer Advice
: Don't explicitly state that a character is a murderer; show them vigorously cleaning a room or throwing out mysterious "trash" to leave breadcrumbs for the reader. 4. Execute a Memorable Ending A great ending should feel "unexpectedly inevitable". How to Write a Killer First Page - Michael J. Totten If you are writing a literal killer or
: Replace weak "verb + adverb" combos. Instead of saying someone "said crossly," use "demanded" or "thundered". " use "demanded" or "thundered".