* Long John Silver from Treasure Island: While he has moments of charm and wit, Silver is undeniably a ruthless pirate who is driven by greed and power. He orchestrates a mutiny, betrays his crew, and is willing to kill to achieve his goals.
* Hyde from The Strange Case of Dr. Jekyll and Mr. Hyde: This character embodies pure evil, representing the dark side of humanity. He is violent, cruel, and utterly devoid of conscience.
* The Master of Ballantrae from the novel of the same name: This character is a complex villain, driven by ambition, pride, and a desire for revenge. His actions lead to the downfall of his family and cause immense suffering.
It's important to note that Stevenson often explores the complex nature of good and evil, and many of his characters are morally ambiguous. While these characters may be considered "evil" by certain standards, they also have their own motivations and justifications, adding layers to their portrayal.