you’ve got some cool concepts there anon
as for your question, technically you could theme your nikkilike around many things due to the expansive nature of your ideas for your protag.
i feel like the frail mental health and the gender/sexuality thing could go hand in hand and you could blend them both. Possibly in earlier parts of the dream world, things could seem binary and set, with solid eye-grating colours, and have it slowly decay as you go deeper and deeper until every line is blurred?
I don’t know, but I do like the idea!
Why those names?