Ysela obvi trains under Estinien for a long while and eventually goes on scouting and hunt missions together. Her nigh-unmatched ability with the spear and unique use of a shield makes her popular with Ishgardians, since she strikes a similar silhouette to Halone. Many temple nights, lords and ladies have tried to court her, but to little effect. Having learned how to calm herself despite Nidhogg’s influence on her, her disposition as an adult is eerily tranquil and stoic. Tataru eventually seizes the opportunity to market Ysela as a hero in her own right, although she's definetly awkward under the spotlight.

I still have a ways to go to develop Y'onah more, but as of right now she's absolutely the more traditionally girly of the two. She's often seen with a Shiva-essence Carbuncle close by: an heirloom necklace from Jae'si enchanted to summon the Carby for protection whenever worn. She's a pictomancer and artist by trade, picking up traditional Sharlayan and Ishgardian education similar to her mothers. Unlike her sister, she revels in the attention she's afforded, often wearing frilly and glamorous dresses of Tataru and Jae'si's design.

I'm actually sad there's not formally a time skip in canon because I'd love to develop them more as actual adult characters along with the actual story.