The grandchild of Aeryn Sun and an un-named person, Ennixx Sun was born on one of the planets in the mist, later to be known as a centre-halo. Aeryn told her all about Crichton and the others back on board Moya, but Ennixx was sceptical, believing them only to be stories.
Nevertheless, she loved her grandmother, and helped her everywhere, protecting her and almost shooting Crichton when he followed Aeryn to take her back to Moya. However, she managed to part with Aeryn when she did finally return to Moya, before Moya moved out of the centre-halo, rewinding time and thus removing her from existence. Which isn't really a death, is it?