Snowflake Crystals

Her Name is Crystal because that is how her eyes look; crystal clear. She no longer shows expression and flutters by like a snowflake; calm, white and pure, yet so bitter cold

His name is Shade, just like his past; buried in the shadows. He can no longer find his own light; he cannot survive without a guide.

THEY are siblings. HE is Crystal's flame to keep her warm. She is Shade's light to guide him through the darkness. THEY have embarked on a mission. THEY will succeed.
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So this is an actual description attempt and it doesn't really give too much away about the plot so hopefully it will relate to the story when its finished