Obsession comes in many forms in Dracula.
1. The villagers are obsessed with religion and think that such an obsession will secure them and keep them safe from the evils of Transylvania.
2. Johnathan Harker and his band of heroes become obsessed with ridding the world of the darkness who is the count.
3. The count is obsessed by Mina, Johnathan's fiance.
4. Van Helsing is "obsessed" with his quest to rid the world of vampirism using a mixture of science and religion.