What is the author's style in Captain Pantoja and the Special Service by Mario Vargas Llosa?

The majority of Vargas Llosa's novel is written in third-person perspective. However, Chapter 3's letter from Pochita to her sister Chichi and Brother Francisco's "Epistle to the Good Concerning the Wicked" in Chapter 9 are both written in first person. In addition, Chapter 9 also features articles from the newspaper El Oriente and Captain Pantoja's eulogy for Olga Arellano Rosaura ("the Brazilian"). In his eulogy, Pantoja refers to himself as "we." Also, Sinchi's radio broadcast in Chapter 7 (presented in the form of a transcript) is in first person. The use of various perspectives gives the narrative texture.