Well, an interesting history of my username, actually. Anyone up for a little storytime? Sit down in a circle around me.
We ready? Good.
My username started out back on the first SCP: Containment Breach Wiki, back when I was a novice roleplayer. I couldn't think of any original number, so I stuck with 9999. The D- obviously comes from a Class-D designation. D-9999 was essentially myself, and I roleplayed sometimes on the chat via pms with a friend or two. At around the same time, I decided to join the SCP:CB forums, after lurking for a while. Since D-9999 was a name I stuck with for a while, I used it. Though the username quickly got old for me, so I changed my username to my real name on the SCP:CB Wikis. I hadn't roleplayed for a while, so that's another reason why I changed it. I could not change it here however, so I was stuck with it. Nowadays, I use "Firefly" and "Rose" as my usernames for most sites. Sometimes with variations.
That's the end of storytime, kiddies. You can stop sitting now.
As for my profile picture, well, you can guess what it is. Just look at the larger version below. If you couldn't guess, it's kind of a tribute to Snipars and the other Montage Parody people.