Ebony D'arkness Dementia Raven Way is a character from My Immortal. She is the protagonist and an obvious author insertion. Defining the character is difficult because of how stupid it is, but she is quite the Mary Sue.
Instead of bothering to eloquently capture her appearance with solid prose, the first paragraph of the fanfiction will be quoted here:
Hi my name is Ebony Dark’ness Dementia Raven Way and I have long ebony black hair (that’s how I got my name) with purple streaks and red tips that reaches my mid-back and icy blue eyes like limpid tears and a lot of people tell me I look like Amy Lee (AN: if u don’t know who she is get da hell out of here!). [[I’m not related to Gerard Way but I wish I was because he’s a major fucking hottie. I’m a vampire but my teeth are straight and white. I have pale white skin. I’m also a witch, and I go to a magic school called Hogwarts in England where I’m in the seventh year (I’m seventeen). I’m a goth (in case you couldn’t tell) and I wear mostly black. I love Hot Topic and I buy all my clothes from there. For example today I was wearing a black corset with matching lace around it and a black leather miniskirt, pink fishnets and black combat boots. I was wearing black lipstick, white foundation, black eyeliner and red eye shadow. I was walking outside Hogwarts. It was snowing and raining so there was no sun, which I was very happy about. A lot of preps stared at me. I put up my middle finger at them.If you're still reading, this is proof that you possess an unusual amount of stamina and tolerance.
In all seriousness, the way the author describes the character is quite attractive, at least if one is into that whole "raven-haired beauty" look. But Ebony's subsequent behavior in the fanfiction is why most people picture her like the image above ▲, and not the image below. ▼
Role in the story Edit
In a sense, Ebony is not really a "character", as much as she is an ominpotent sex-lord who functions as a medium for the author to explore her juvenile romantic fantasies.
The story doesn't involve much of a plot per se. Things just happen, often for no reason. If "terraforming goth fashion into the Harry Potter universe" makes sense, this is a good approximation for what she does for most of it. Trying to make sense of everything is an impossible task. There will be no attempt here to chart an actual comprehensive summary of her arc. If you're really that curious about it, her page on the My Immortal wiki is very detailed.
But basically, Ebony does stereotypical goth things, goes to concerts, and has sex with fellow students. That's about it.
Ebony also exists as a prop for the author to voice her (quite simple) views on "preps", a category of people that essentially includes everyone who is not specifically goth.