One trait Rainsford and General Zaroff have in common in the short story is their passion for hunting and their extensive knowledge in hunting. They both have traveled around the world hunting the most desired and exotic game and both have been doing it for a long time. Rainsford even wrote a book on hunting. Another trait they possessed in common, in the beginning of the short story, was their callousness toward hunting. They both regarded prey animals as having no feelings or emotions when it came to the hunt. They felt nothing for the animals they hunted.
An obvious difference the two characters possess is their level of sanity. They differ in the lengths at which they will go to achieve the thrill of the hunt. Rainsford is content to hunt animals, while General Zaroff has grown bored with it. He has rationalized in his mind that it is okay to hunt humans. He has no boundaries when it comes to hunting, whereas Rainsford still does.