I love it too, but damn if it doesn't elude me. If I had to guess I'd say it's a light Russian? I mean I know she's not human but What's-his-face on the Quarian ship sounded British so why the fuck not?
8O Perfect stamp for me. Period. I thought I was all alone T A T I could listen to her voice all day and never get sick of it. That reminds me I love how she says "Shepard" and, of course, anything with an 'r' in it, really.