Shinji Matou is a prominent character in the 'Fate/stay night' series, known for his role as an antagonist. He is a member of the Matou family, one of the three founding families of the Holy Grail War. Despite not being a skilled magus, Shinji is arrogant and manipulative, often using underhanded tactics to achieve his goals. His deep-seated jealousy and inferiority complex primarily drive his actions. Throughout the series, Shinji's complex relationships with other characters and his struggle for power highlight his flaws and ambitions.