Pi Patel is a round character because he changes throughout the story. Richard Parker, the tiger aboard the life boat and a symbol of Pi's animalistic changes, is a dynamic character. Pi and Richard Parker were both motivated to stay alive at sea after the ship they were on sank.
Pi changes throughout the story after he must kill a fish in order to survive. He believed in the importance of life for all living things, and struggled to kill a fish, but realized that he had no other choice if he wanted to survive while on the lifeboat. This went against his morals and beliefs, making him change out of necessity.
