Loona

Misa died at sunset because she couldn't live in a world without Light.

Light walks past his past self, reflecting the path since lost and which he can never get back.

Innocence can not be regained. Death is an eternal stain.

That much I knew for New World.

What I didn't expect was how the color palette of the sunset felt painfully symbolic of the overall culmination of Light's journey and his adversaries pursuit of him.

Light has always been given red undertones. L, Near, and most of those who doubted or suspected him were given blue or at least cool colored undertones.

Red is passion, rage, blood, a warning sign that psychologically catches your attention. Blue is serenity, intelligence, tranquility, traits that Light's biggest adversaries exemplified to the T.

And at the very end, it all ended under a purple sunset.

Light ran under a purple sky, carefully crafted suit of deception caked in his own red. The two fronts have collided, and Blue has finally caught Red.

Perhaps the purple was inevitable, really. Splatter red paint over blue and mix it, you'd get the same color even if you did the inverse. Purple was always the finish line.

Anyway, regardless, Light is doused in warm and red undertones despite his rapidly encroaching death. As he collapses on the stairs and lies halfway between a heaven he lost the privilege to years ago and a hell that wouldn't suffice for him, he is doused in the purple light of the chase's end. And even so, immediately around him, he is still caked in a red undertone of shadow. It is lost in a sea of purple, and when his blood finally stops running, he too will succumb to purple and its end.

He hallucinates L (god they're so gay) and he's a stark blue in comparison to the murky surroundings. They'll join in death, and red (Light) will meet blue (L), a stark contrast to blue (Near) catching red (Light) in the end.

At the very end, as Misa is about to leap, the cityscape pans upward. The earlier gray clouds of uncertainty and ambiguity have visibly cleared, revealing the two colors clashing for years, and the end result of both their efforts. It's purple, yes. And closer to the ground, Light is still writhing with red undertones. But the sky above him, the almighty cosmos that would have outlived Light and his reign sparkle a deep navy blue. The moon is waxing, its light returning to its darkened surface. Indeed, the world can go back to normal now that Light is no longer a threat. But his name in kanji includes the character for "moon", and it can also be seen as Light not quite ascending, but simply leaving this plane.

Regardless,

Light dies on a red ground, both his undertones and blood bleeding. The cityscape is bathed in purples and pinks, the debris and damage of both fronts finally revealed after so long, with no clear winner if you are not an insider. And above all the power Light believed he had, the stars and moon resume their natural cycles and movements; blue, and vividly so. Light was no God, he was just the idea of one. Whatever God Light believed he could usurp, He was unbothered, resting among the stars Light attempted to reach and died trying. Or maybe even nonexistent.

Light challenged a notion he had no say in. Light lost, bleeding and dying for what he believed in. Even when everyone had gone against him.

The world can't live without light, this is true. But which light? Because there's sunlight, forever associated with the true God or something adjacent, that which Light strived to become. But then there is moonlight. Nights would be darker without it, this is the truth, but it's despite the amount of lifeforms on the planet would be impacted by its absence, it still would not be nearly as catastrophic as no sunlight.

The world needed a version of Light, stationary and content with where he was. He had it all going for him. His fate was sealed when grew bored, a light indeed too bright and brilliant for this world. Light was a perfect moon who wanted to become a star, a Sun, a God, and scorched the world in the process, only to die out softly like a dying white dwarf.