A non-corporeal Medusan renowned for his aptitude in spatial navigation and rendered a virtual recluse by his unfortunate visage, which shocked Humans into insanity on sight. Traveling within his own transport chamber for safety during his transport to the Federation, Ambassador Kollos checked aboard the USS Enterprise with a Human engineer, Larry Marvick, and a Human telepath, Miranda Jones. Jones was unaffected by Kollos’s appearance because she was blind, though she did not advertise this fact.
While Medusan are genderless by their nature of being non-corporeal, energy based creatures, Kollos used he/him pronouns. This is likely due to the era in which the show aired.