Katima appears to be a female anthropomorphic seagull.
The immortal priestess Katima was the only Shapurian who stayed behind when the immortal people of the lost city scattered through the planet as eternal tourists. She was left with the Scepter of Shapur, as keeper of the city; she layered deep illusions to convince explorers the city had disappeared, and would erase the memories of any who got too close. In spite of this latter duty, Katima was a kind and caring person who did her best to mislead explorers the old-fashioned way to avoid resorting to these drastic measures, and she made sure none of them got hurt or worse in the process.
Behind the scenes
Katima only ever appeared in the 2017 story The Secret of Shapur.