Glee, the girl of mystery

Hi all!
Finally I finished my assignment with the spirits of hell, and that means that I can stop drawing creepy damned souls...

Today I realized that I've done a lot of sketches in this last period, but I didn't finish even one... So today I decided to start working on all of them again. The first one is that of "The Girl of Mystery", the one I like most. Here is the finished line art . I'll color it when I'll have time to use the wacom tablet of the university (I don't have my own yet).
I'm really happy of the results this time. I hope you like it.

"She is the girl of mystery
She is the devil of lies
She is the keeper of a secret
Hell is dancing in her eyes."

Who is Glee?

Hint: She is a quite famous character in the Core D&D and Planescape setting.
I'm using her in my current adventure, like a NPC. She seems to have some mysterious link with Alak, the drow [link]

Try to guess her true identity and send me a note with the answer. : If it is correct I'll draw something for you.

Here is another version of the pic [link]