Decided to not overthink if i should simplify my answer n just ramble away but!
Clara is rather simple to balance out most of the craziness that goes around her. Base upon ballet and Christmas, her story takes inspiration from the nutcracker and some loosely wizard of Oz. A woman in her young twenties trying to rekindle her love for ballet after a bad accident and trying to find herself, especially after a rough year both with her ballet career and in her personal life, as she's in that period of finally an adult but things in life are on fire(hence her rather gloomy demeanor at the start).

You could say her is coming of age story college edition hahaha. Trying to see what she wants to do and life n grow more confident.

Overall that there is a fun "mystery" to her of like the twins not be able to predict her future properly, something always off about it. Enjoy the idea Clara and Akira actually are best friends in real life but the day Akira was supposed to go an eclipse happened and they switched spots. Her bear is named after Akira, when she needs to be brave she holds dear to it as she always saw Akira as someone brave. Does have a tendency to age regress but it isn't anything crazy just certain motions bring back certain memories that soothes her(biggest example is her needing to hold her teddy bear at all times or she will break down crying, and to be fair to her she is easily overwhelmed by the whole situation, the more confident she grows the less she needs it) . Childish but not immature, have the same mental maturity as Akira just again her age regression tend to fool people into thinking she's meek.

and lastly, i think out of all my yume ocs Clara is by far the only one who does take SOME inspiration from my life directly, as I used to be a lot more shyer/quieter now I can't shut the fuck up n don't relate exactly to Clara but she the closes i have done so far to my life, even if it is loosely.