Hello there, my name is Ethan Oxton. I'm just beginning my topic... I know it's a bit late but I believe 14 days can be enough to make something looking pretty decent.
I had some problems in my life but everything is on an "okay" way now and I'm very excited to get my hand dirty!
I chose the Dark side because I like this side better, and my idea for the contest is something like this: (okay buckle up, I write a lot.)
There were once, a young girl very happy like a child would be, ignorant and free.
She didn't have an idea about how life can be cruel, how people can be cruel and selfish...
As the years went, she became a young woman who was slowly noticing the real face of life and humans.
Her father was violent and she saw things that other children would never see. She couldn't speak to anyone about her life because she had no friends, her heavenly life went darker and darker as she grew up.
Her parents divorced, his father forgot about her existence, and her mother was constantly saying -- YOU are the reason your father left me!!--
She was always acting very gently, and she had never lost her smiley face because she trusted everything will go bright in a near future... But she was wrong.
After two long years of working in her dream job, a job that was a perfect start for her, waiting for a contract from her boss with empty promises and never being paid at all, she was losing hope...
Her mother was acting stressful and aggressive to her, but not voluntarily... just like her father she hadn't see for years now...
The young woman that once was bright and cheerful, that always wondered why evil people exist, that only wanted a simple family life, that whatever happened always stayed cheerful was gone...
She screamed inside of her so nobody could hear her heavy pain, and she snatched her younger self-photos thinking she wasn't worth to be happy... and her hair turned black gray slowly, and her skin went cold as a stone, and she tossed all accessories she had from her mother away, so she will never see her mother's face ever again.
She became a demon that drains the joy of others with their colors until they become gray and lifeless and as her victims turn into dry and gray living corpses, her eyes became colorful everytime she drained another victim, she is called
--The Joy Drainer--
(STOP HERE IF YOU WERE SCROLLING TO SKIP THE STORY)
Okay, I know the storytelling part isn't necessary, especially because it's not asked (what a genius here), but I thought it would help myself to do the character with a backstory, just to give her a life.
Thank for reading so far, and I'll update this Topic very soon with the concept art (hurry up!), I promise. 
And I'll see you later.
Artstation: https://www.artstation.com/oxtonday
Twitter: https://twitter.com/EthanOxton
A little sneak peek I did a few days ago:
UPDATE: (I almost forgot to put my so well known "MoodBoard")
Keep in mind these are very inspirational and more pictures will be added, I'll update every time I change it:
Please forgive my English if any mistakes happened, it's not my native tongue)
Okay, I have the concept art kinda ready, I'm going to jump into Zbrush today, I'm happy about the result, and I hope it's a pleasant concept.
I might do color variations!
And here is the concept:
So I have updates, unfortunately, my PC's Hard Drive died two days ago... 
I had to replace things etc.
But I managed to get back a "checkpoint" of my 3D model WIP.
Here it is:
