Ayiana Yorval grew up in Najana City on Trill. It was a coastal city notable for its many pristine beaches, and the location of the famed Najana Library; one of the most extensive archives on the planet. As a child, her parents often took Ayiana and her sister Aleesia to the library and museum. It was these trips that first instilled a love of science in the young Trill. Ayiana spent many days playing or relaxing on the beach.
Ayiana initially had no desire to be joined, but she was a very intelligent girl. During her teenage school years, one of her teachers thought she should apply to be Joined, due to her excellent grades and inquisitive nature. Ayiana thought it over for some time, and along with her parents’ support, she applied to the Trill Symbiosis Commission.
With her newfound interest in becoming Joined, Ayiana had to strive harder than ever to prove herself. Reaching adult age (roughly 18 Earth years old) she was accepted to the satellite campus of Starfleet Academy at the Trill Science Ministry. Ayiana would be the first host of Sevo to join Starfleet.
At the age of 23, she spent a few weeks being evaluated under a Joined field docent. She was given a good recommendation and was accepted for Joining. It took nearly a year find a suitable Symbiont to match her with. In the meantime, Ayiana continued her studies at Starfleet Academy. The symbiont Sevo shared a similar interest in the sciences - one of its previous hosts was a chemist. Upon the death of Sevo’s third host, it was transferred to Ayiana at the start of her final Academy year at the age of 24.