The harsh first officer of the starship Vortex in the Doctor's holonovel Photons Be Free, a Bajoran with a facial tattoo who is a transparent stand-in for Chakotay.
Katanay is a character in Photons Be Free, the holonovel the Doctor writes in the Voyager episode Author, Author. The programme casts its user as a mistreated emergency medical hologram, and Katanay is the first officer who helps to keep him in his place.
The Doctor has altered Chakotay only slightly, giving the character a Bajoran nose and earring and a larger tattoo. In the story he is a bully who enforces Captain Jenkins's orders without question.
The real Chakotay is among the officers who object once the crew has played the novel. The dispute over its publication ends in a hearing on whether the Doctor, as a hologram, can hold rights as an author at all.