SPOILERS FOR STARLIT VOID AHEAD. PROCEED AT YOUR OWN RISK.
I thought too much about Mira before everything happened, because they clearly weren't always a black hole. I tried to mimic the shape of Mira's cape from the fight, but otherwise gave myself artistic freedom to do as I wished. Look at them, they used to be so happy.
@emberconstellation it seems like you like seeing fanart
Spoiler warning is still in effect. I feel like talking about some of the things I wrote on the image. Some of those thoughts and ideas are somewhat interesting and I want to expand on them slightly.
Starting with the more obvious ones:
"Yes the resemblance to Spica is intentional. I want to add to the preexisting themes and parallels"
"Did they ever see their reflection? Is it kinder if they did, or didn't?"
These two are linked together, so I think talking about them together is reasonable. It's the difference between them seeing Spica (especially in despair route) and maybe seeing bit of themself in the young star based on behavior alone, or taking a single look at Spica with Kimon and Hazel and potentially seeing themself being escorted by the king and by guards to their prison cell. It's the difference between "I was just like you, long ago" and "I was you in every way, wasn't I?"
"Do you think about how there's no bed or chairs visible in the cell? I do. They thought stars couldn't feel pain, so why would they need comfort?"
This was a very cruel thought to have, but these were clearly very cruel people who did not care as long as they got what they wanted. So much evil can take root when such cruelty to others becomes justifiable in someone's eyes. Even if he did have a bed, I doubt it was a nice one. Still, it's interesting to think about exactly how far they would have been willing to go. They clearly weren't interested in letting Mira rest any more than they had to.
"Does Mira have chronic pain or fatigue? From the literal burnout? I think he should."
Connecting to the above, he never got to rest properly. I think he should suffer the consequences of this. At one point, Lost, when telling a story about a Star, says that "They lost their light. Their power. Their connection to the stars. They cannot do anything, now. Cannot speak with humans, can barely walk. Unable to live, unable to die." Now, this is likely a very extreme case, but it demonstrates that for a Star, losing their light can lead to disability. I would argue that it certainly seems like Mira has lost their light, given that they are described as having dimmed light in the untitled book in the room before the cell in the castle, alongside their current appearance. I think chronic fatigue or chronic pain both fit, as Mira clearly was in pain, based on the book mentioned above, and they appear exhausted. It would not surprise me if the reason Mira stopped fighting back was just because he no longer had the energy or hope left in him to do so.
Additionally, there are the hidden secret ones that blend in with the background:
"This kingdom was built out of stardust, built on the backs of stars they ripped from their homes. How many? Too many."
Look at Azmidi. Look at Mira. Look at Spica in the neutral route. Look at Lost's stories. These people keep insisting Stars suffer and sacrifice for them. Azmidi says they don't even bother to learn even a word of the Star's language, forcing the Stars to learn to speak theirs instead. They are forced into boxes and cages, locked up and told to talk a certain way, told to just listen and help. They aren't treated like people. Of course something like the events of the game happened. Everything finally reached the boiling point.
"How do you survive a world where you are expected to suffer... for others gain? Trick question. You don't. Not when you are so easily replaced..."
This one is paraphrased, but Lost says it quite well when talking about the First. They could simply call down star after star. There wasn't an endless supply, but there was more than enough. Mira was never going to come out of this unscathed.