I don't typically associate Rhyme with the Moon even though Sun/Moon is a very fitting dynamic for Leona. I moreso associate her with the Sky; a boundless freedom that homes others (stars, sun, etc) while always being different to everyone at different times.
Similar to the phases of the moon, but Rhyme is known differently from different people. When they look up at the sky, not everyone sees the same state of the sky. Stormy rain, a night sky, a setting sun...and always rotating and always a "normal" sky to them despite it.
You look up at the sky to see vastnespossibilities of whats in it. Rhyme always wants to find something new in her. The sky is a mirror to emotions, and Rhyme is a deep feeler, and wants others to have a grasp of themselves inside.
The sky is infinite, and with infinite comes the unknowable, and although we want to know, we understand we can't know everything. Rhyme always wants the truth, but realizes some doors are best left unopened, and you move on, but you are never left without something π