Robot constructor who receives the wish-granting machine, uses it to manufacture a duplicate of Trurl, beats it savagely while maintaining plausible deniability, outmaneuvers Trurl's humiliation through social cunning, and ends the story furious at being denied credit.

Klapaucius's colleague and rival who secretly hid inside his own wish-granting machine to spy on Klapaucius, gets beaten, escapes, and ultimately converts the humiliating incident into a triumph of reputation at the Royal Court.

A potbellied, four-legged machine sent by Trurl as a supposed gift; produces material goods and a perfect duplicate of Trurl; actually contains Trurl himself hidden in its belly.

Ruler whose court hears Trurl's retold story and who rewards Trurl with the Order of the Great Parallax.