Marquis's best-known creation was Archy, a fictional cockroach (developed as a character during 1916) who had been a free-verse poet in a previous life, and who supposedly left poems on Marquis's typewriter by jumping on the keys. Archy usually typed only lower-case letters, without punctuation, because he could not operate the shift key. His verses were a type of social satire, and were used by Marquis in his newspaper columns titled "archy and mehitabel"; mehitabel was an alley cat, occasional companion of archy and the subject of some of archy's verses. The archy and mehitabel pieces were illustrated by Cartoonist George Herriman, better known to posterity as the author of the newspaper comic Krazy Kat. Other characters developed by Marquis included Pete the Pup, Clarence the ghost, and an egomaniacal toad named Warty Bliggins.