Nick Arnstein is a character from the musical Funny Girl, which tells the story of Fanny Brice, a famous singer and comedienne. He is portrayed as a charming but somewhat unreliable man who becomes romantically involved with Fanny. His character adds complexity to the narrative, highlighting themes of love and ambition. In the musical, Nick is depicted as a gambler who struggles with his own aspirations and the consequences of his choices. His relationship with Fanny showcases the challenges of balancing personal desires with the demands of a public life, ultimately influencing her journey to stardom.