He/She is called a clown.
A card player.
A "harmonicanist" is what a person who plays the harmonica is called.
A person who plays Scrabble is called a Scrabbler. (unofficially)
A person who plays the piano is called a pianist.
A keyboardist, a person who plays Piano is a Pianist.
A person that play a saxophone
''Kayako Saeki'' is the character's name, but the person who plays her is called Takako Fuji.
bassoonists
a playwright
a pianist
Mellophonist
a pianist
cymbalist