Joe Banks is the main character in the film "Joe Versus the Volcano," portrayed by Tom Hanks. He is a disillusioned and unhappy man who feels trapped in his mundane life. After being diagnosed with a terminal illness, he embarks on a journey that leads him to self-discovery and adventure. Throughout the film, Joe's character evolves as he confronts his fears and embraces life. His quest takes him to a tropical island, where he learns about love, purpose, and the importance of living fully. Joe's transformation highlights themes of existentialism and the search for meaning.