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The most important being in your story is the main character -- it doesn't have to be a human!
you call this person a "confidante"
Usually you would call the person a reader.
what do you call a person that takes ships into and out of port
The Character is the eponymous character, and sometimes the play might be called eponymous, but not often.
A "harmonicanist" is what a person who plays the harmonica is called.
A person who plays Scrabble is called a Scrabbler. (unofficially)
A drummer or percussionist plays the drums.
a cymbalist
harpist
An organist
Guitarist
a baritonist
guitarist
A saxophonist.
accordionist
A pianist.