I'm Gerneral Zaroff My three main traits are: Insane Smart agile
General Zaroff is insane because he hunts people, but claims that he is civilized. He doesn't think of murder as.. murder, but as just another hunt.
The scene where Rainsford is hiding in the tree is a great example. Zaroff finds him, but leaves him for another days hunt
Zaroff is smart because he can very easily follow even the hardest trails. Even in the dark, he doesn't seem to struggle. The last example shows this since he was following Rainsford in the dark of the night.
Finally, Zaroff is very agile because he can maneuver and kill in the thick, twisted jungle that covers most of the island.
While Rainsford has to carefully step when in the swamp, Zaroff is said to be sure footed and fleet.