Mia

First Life
Dyon met them at The Cathedral, her and her sister were nuns there.

Appearance
When found : "They had deep indigo colored hair that almost looked black unless the sun reflected upon them the right way. In addition, their hair was much longer than what one would expect for a child. Their coffins were lined with comfortable velvet cushions, but their hair was actually long enough to act as their blankets. Their hair suddenly flickered, shifting from the deep indigo Dyon thought he saw before to a deep maroon. Moments later, it became a deep magenta."

Origin
“They weren’t naturally born Dark Phoenixes, they are a necessity that Heavens mandated for its balance, so it was likely that their normal human bodies were clashing with the Dark Phoenixes slumbering deep within them.

“They had to be reborn, but the excess life energy of Soul Planet thanks to the Life Stone was slowing that process down and clashing with the work their souls had to accomplish… This ended up rotting them from the inside out as life clashed with death.

“Eventually, life lost and they died, allowing their true Dark Phoenix selves to accomplish their task and help them be reborn. At least that’s the old man’s theory… He’s probably right considering his breadth of knowledge.”