Quentin Coldwater is the main character in the fantasy series "The Magicians" by Lev Grossman. He is a high school student who discovers that the magical world he read about in his favorite books is real. Quentin struggles with feelings of inadequacy and a desire for adventure, which leads him to enroll in Brakebills, a secret school for magic. Throughout the series, Quentin faces various challenges as he learns to harness his magical abilities. His journey explores themes of friendship, identity, and the consequences of seeking power. Quentin's character development is central to the narrative, highlighting his growth and the complexities of adulthood.