Chapter II, of Mary Shelley's Frankenstein, offers readers substantial insight into Victor's interest in science and this interest's impact on his personality.
In this chapter, Victor's initial interest in science is revealed.
Natural philosophy is the genius that has regulated my fate; I desire, therefore, in this narration, to state those facts which led to my predilection for that science.
Here, Victor defines the budding of his scientific mind. His interest in natural philosophy first began when he read Cornelius Agrippa. It was the works of Agrippa which sparked his interest.
Later in the chapter, Victor admits to his obsessive nature. Enthralled by Agrippa, Victor decided that he must read everything written by the man.
When I returned home, my first care was to procure the whole works of this author, and afterwards of Paracelsus and Albertus Magnus.
The fact that he gathered and read complete works shows his predisposition to obsession.
All of this said, Victor's predisposition to science over takes his personality. His studies and experimentation with reanimating life proves to be so consuming that he fails to care for himself or make contact with his family. Essentially, science is everything to Victor. Therefore, Victor's strong interest in science speaks to his obsessive personality and refusal to accept the advice of others (given he refuses to listen to either his father or his professors).