Speaker
The word persona is a feminine word but it can refer to a man or a woman. It is always "la persona" even if the person is talking about a man
A persona, from the Latin for mask, is a character taken on by a poet to speak in a first-person poem. Anthony Thwaite's 'Monologue in the Valley of the Kings' uses the word 'I' but it refers, not to the poet, but to the Pharaoh, Thwaite's persona in this poem.
Another name for a sung poem is odes.
epic, poem, song
Since you didn't tell us WHICH poem you're talking about, nobody can answer the question for you.
The central idea of a poem is the main theme that is represented in the poem. Topic is another word for theme.
Another word for talking quietly is whispering.
Discussing.
Another word for talking fast is yapping, I really dont even know if It`s a word but it's just what came into my head :L x
Another word for signs is probably going to be symbols but it depends on what you're talking about
Running at the mouth
mutter