Tom Hagen is a fictional character from Mario Puzo's novel, "The Godfather." He serves as the consigliere, or advisor, to the Corleone family, a powerful Italian-American crime family. Tom is known for his calm demeanor and sharp intellect, often helping to navigate complex situations with diplomacy rather than violence. As an adopted son of Vito Corleone, the family patriarch, Tom is deeply loyal to the family. His background as a lawyer allows him to handle legal matters and negotiate deals, making him an essential part of the family's operations. Despite not being a blood relative, his bond with the Corleones is strong and unwavering.