The red and blue couple was one of the commonly used pairings in literature and entertainment works. To be specific, the red and blue couple referred to Jia Baoyu and Lin Daiyu in "Dream of the Red Chamber" and Harry and Ron in "Harry Potter." In addition, there were many other red and blue couples in the anime, such as: - Naruto Uzumaki and Sasuke Uchiha from Naruto; - Luffy and Zoro from One Piece; - The people and humans in the virtual circle in Death; - Megumi Hashida and Yoko Katsuki from Gintama; - Inuyasha and Kagome from Inuyasha. The red and blue couple was very popular in anime and often appeared in the plot to attract the audience's love and attention.