Risa

Its funny too because being a trill recipient makes the allegory very "conservative friendly" . They literally gained dozens of lifetimes worth of memories where their gender and birth sex were male and female. Normal trill symbiote candidates go through training in order to better retain their sense of self after they bond and better separate the memories. Adira did not have that training and was not ready for this or even the right species for it.

Riker absolutely lost himself while he had a trill implant and became the trill. Meanwhile Adira has a few hundred or more thousand years of being a mother, being a father, giving birth, and presenting as male and female and over that kind of time span even seeing gender roles and norms change and evolve. After all that they decide you know what I dont think Im quite a girl anymore but Im not a boy. Even a gender absolutist would have to give it to them.