Originally written for a prompt on Reddit. ^^
She came one morning to the city of Innsmouth, the most beautiful girl the world had ever seen. She was tall and slender as a young birch tree, with long locks of auburn hair the colour of autumn leaves, that shimmered in the rising sun. Her eyes were a deep shade of purple, changing like the sky according to the subtle variations of her mood and thoughts, and she had curves in all the right places.
Clear-skinned and rosy-cheeked, she walked towards the sand-clogged harbour, a vision of terror for all to behold, and her sweet perfume of jasmine and roses eclipsed even the familiar stench of rotting seaweed. Before the day was done, she had tried to 'improve' the town by adorning their houses with flowers, she had disrupted their ceremonies while visiting the church of the Order of Dagon at the wrong time. She had tripped over the lectern and knocked over the sacred Book of R'lyeh, closing the gate to the world of the Deep Ones forever, and towards evening she had started organizing a resistance movement against what she called the Order's ''religious extremism''.
They tried to lock her inside her room all night, but luck, and an uncanny ability to find escape routes unknown even to them easily got her out. They tried chasing her through the dark, decaying streets of Innsmouth, but their efforts were no more successful in driving her out of town than a game of hide and seek.
In desperation they turned to the Great Old Ones, whose power they hoped could deliver them of their predicament. Just before dawn on the second day, the ritual was complete and the Great Cthulhu himself rose from the sea, gigantic in all his cosmic, immortal glory. From his inhuman throat erupted terrible, dragon-like thunder, but the girl Mary-Sue merely sighed and shook her head, unafraid and certain that his grim, unseemly apprearance disguised nothing but a deep yearning to be loved. Obviously, even he only needed someone to understand him.