The voice of the author
The author's voice is present in every letter and in every essay which survived and as such, it is one of the most reliable elements in the collection. The narrator presents his point of view directly and through him, we can also see the society in which he lived and the social conditions of the time. The narrator is extremely truthful in his social criticism and in the way in which he presents other philosophical points of view and also extremely candid when talking about his own past and his own shortcomings.
Herodotus
Herodotus is the man to whom the letter “Letter to Herodotus” is addressed to. The character does not speak since he is the one to whom the letter is addressed to. Still, from the writing style and from the way Epicurus addresses him, it is clear that the author sees the young man as a very capable and intelligent person, someone who can understand even his most difficult teachings. He is also seen as a disciple, given the job of spreading Epicurus’s teachings even further to the masses.
The normal people
One of the categories criticized in "Letter to Herodotus" are those described as being the normal people. These people are seen as lacking the intelligence to understand the real meaning of life and to pursue the real form of happiness.
The intelligent people
The second group in "Letter to Herodotus" is made out of those who are capable to understand extremely complex ideas. These people are the ones who the author sees as the responsible ones in society and the ones who have to pursue the greater good in society.