The crossword solution for the term 'Cartoonist Addams, Informally' is CHAS. Chas Addams was an American cartoonist and humorist best known for his darkly humorous and macabre characters. He created the Addams Family characters for the single-panel cartoon series that originally ran in The New Yorker from 1938 until his death in 1988. His cartoons have since been adapted into television series, films, books, and video games.