Cartoonist – Someone who writes and illustrates their own stories or jokes.

Penciler – A person who illustrates a story in pencil.

Inker – Someone who go over the pencils with ink and adds shadows.

Colorist – A person who adds color to the comic.

Letterer – Someone who adds the text and balloons to the comic.

Illustrator – A person who does more than one or all of the above jobs (penciler, inker, colorist, letterer).