Nathaniel Fisher is a fictional character from the television series Six Feet Under, created by Alan Ball. He is portrayed by actor Peter Krause and serves as one of the main characters in the show, which revolves around a family-run funeral home in Los Angeles. Nathaniel is the eldest son of the Fisher family and often grapples with the responsibilities of managing the family business while dealing with personal struggles. Throughout the series, Nathaniel's character explores themes of mortality, family dynamics, and the complexities of life. His relationships with his siblings, particularly David James and Claire Fisher, play a significant role in the narrative, highlighting the challenges and bonds that come with family life.