Celia Blackmist

Celia Blackmist Blackmist is, by her own word, 26 years old. She is a witch and herbalist, living in the outskirts of a small village called Hawthorne, in the kingdom of Vaniel. She is petite, bearing a slender figure with a small bosom. Her face is pale and seemingly eternally tired, with faded crimson eyes and long white hair. Her wardrobe is filled with black robes and wizard hats. Most of them are keepsakes from her mother.
Celia Blackmist is aloof, but polite and ultimately kind. Inwardly, she considers speaking with people useless, because none of them are real - herself included. To keep her sanity, she does force herself to interact with them. Also, despite herself, she feels some small sense of happiness when visiting the nearby village, where she is considered the local healer. Any wounded or ill people come visit her cottage down the path leading out of the village.
Celia Blackmist stopped aging physically at the age of 26, when she discovered the secret of her world. She has lived for almost 300 years, though she has long since lost track of her actual age. She cannot die, having become a fixed point in time. Any attempts to kill herself, or be killed by someone else, result in her waking up as if the entire day had not happened. Celia Blackmist has long since stopped bothering trying to tell people the truth, as it only made her look insane. Now, she has resigned herself to an eternal existence within an unending story.
In the far west of this world, there was once a ruler - callous and evil beyond measure. So great was the hatred in his soul, such power he held over his great armies, that none dared threaten him, be they beggar or monarch. King Nemo the Mad, they called him... for wherever he tread, a path of commoner blood followed. The populace was too afraid - too powerless to stand up to such tyranny. Though peasants, nobles and soldiers alike thought King Nemo invincible, there was one thing he feared: witchcraft.
And so, the mad tyrant, seeking to reinforce his iron grip upon his domain, ordered the prompt execution of any and all practitioners of magic - be it of the white or the black. Celia Blackmist's family was among them. Simple healers and herbalists who faced cold, unflinching steel, despite the goodness of their hearts. It was only due to a quick invisibility spell from her mother, casted like unto a glamour over young Celia Blackmist, that she survived the night... and there she spent it, huddled against a corner, holding the severed head of her loving mother.
In that moment, even so young, revenge consumed her every thought. With every sorcerer and witch in the kingdom put to the sword, King Nemo thought none could ever oppose him. As she aged, Celia Blackmist prepared. She became a hermit, spending every last second of her time perusing the hidden tomes of her family, becoming more and more powerful. By the age of 26, she had begun to unravel the mysteries of this world, now unfettered by the limited knowledge of her family's books... until one terrible truth became known to her: Nothing in front of her was real. Not the books. Not her hands. Not the very floor she stood upon. She, like everything - everyone else... was fiction - a character meant to play a role in someone's accursed story. Her suffering had been but words upon parchment, to entertain an unseen reader.
A profound sense of emptiness filled the young woman, and if only to deepen the pit of her despair, the news of the King's natural demise spread through the realm. Revenge, however pointless, was now lost to her. All that remained was a fake existence in a fake world, filled to the brim with fake people... and so, years passed. Years turned to decades. Decades, to some few centuries... but still she remained, not looking a day over the age she discovered that horrible truth at.
Now, she lives an existence without purpose. Her only refuge, ironically enough, is reading. It is when her mind travels to the worlds within those pages that she forgets about the nature of her own. Using her centuries-spanning botanical and herbal knowledge, she can produce tremendously potent remedies, which she sells to wayfaring adventurers in her abode. She often provides them for free if any ailing villagers from Hawthorne come visit her.