Cyan is the byproduct of what happened when Blue Pearl and Desiree became stuck in some sort of odd permafusion that has little to no recollection of their original halves.
[insert short description about character]
A Gem is created to serve her Diamond in the Diamond Authority. One Gem, Blue Pearl, was created to be the servant of Blue Diamond. Quite the honor indeed. [self-explanatory]
[relationships with family, other characters, etc.]