A non-binary person, or enby, (PROSE: White Canvas) was an individual who presented themselves with a non-binary gender identity. Many non-binary people identified with they/them pronouns.
Calypso Jonze was a non-binary person. (AUDIO: The Lovecraft Invasion)
Both an incarnation of Romana (PROSE: Lord Romanadvoratrelundar) and Zoria used gender-neutral pronouns. (PROSE: Zoria)
Daughter of Donna Noble, Rose was a non-binary person, using she/her pronouns and presenting feminine. (TV: The Star Beast)