Jonathan Harker is curious and persistent. You might also call him naïve, at the beginning, because he did not really look into what was going on. He did not know what he was going into, he just went to find Dracula.
Obviously, the most important character is Dracula. He is unconscionable and mesmerizing. Another main character is Jonathan Harker, who ends up killing Dracula. He is determined and persistent. Other important characters include Arthur Holmwood, whose love, Lucy, becomes a vampire and whom he ends up having to destroy because of this. He kllls her and is grief-stricken because of it. Arthur is selfless and brave. Mina is Jonathan Harker's fiance. She almost becomes a vampire, but is saved from becoming one. She is compassionate and resilient. Finally, Van Helsing is a vampire hunter who aids in finding ways to destroy Dracula and leads the hunt for him. He is one of the men who helps fight off the gypsies who try to prevent Harker from killing Dracula. Van Helsing is intelligent and perceptive.