What is the author's style in Fall of the Roman Republic by Plutarch?

The book is written in first person by Plutarch, who lived in the day of these happenings and had first-hand knowledge of many of the events as well as personal knowledge of the people. It should be noted that Plutarch seldom includes the word "I" in his writing, only occasionally inserting his personal observations as his own. More often, he tells these stories in an objective tone. However, the reader should be aware that there are introductions at every chapter that are not written by Plutarch but are an opinion on Plutarch's information.