Killer

A killer is a criminal who kills for its own sake. If such killing is incidental to committing robbery, then the character is more likely a robber. Someone who kills for political motives is an assassin or a terrorist.

Bluebeard

Sawney Beane

Sweeney Todd

Jack the Ripper

Raskolnikov

Peter Kurten

Norman Bates

Charles Manson

John Wayne Gacy

Ted Bundy

Hannibal Lecter

Ed Gein

Boston Strangler

Son of Sam

Richard Speck

Zodiac

Jeffrey Dahmer

Killer

The Known World hrairoo