A lot are obvious, but I think we all often wonder about what the history is behind some of the user's avatars here. For example, boogieman, justadub, isuedtoberich, kling&allen, etc. Just curious!
Just good memories mainly.
I've went by some form of boogieman since I was about 16. When I was 13 or 14, my niece was 3 or 4 and we told her boogieman stories. Not to scare her however, she loved it. Basically the boogieman lived in the bushes and would look really scary, with his big red eyes and big sharp teeth. Then he would pull you into his house and... suspense builds... feed you cake and ice cream!

It was always something that seemed like it would be scary but ended up funny and she really loved the boogieman stories. She would be at the park and fall off the swings or something as kids do, we would be concerned but she would say it didn't hurt, she had boogieman powers.

I had some old crayola program on a computer where you could draw and bucket fill the image, really crude program, but I used it to draw her a 10 page comic book. She probably read that thing a hundred times.
Later in life we were kind of reminiscing about the stories and she told me that she told kids at preschool about the boogieman and boogieman powers and she couldn't figure out why they thought he was scary. We got to laughing and she said the kids probably though she was nuts!
As for the picture itself, I created it when I got into pixel art for a while. The creature itself is hand pixelated and took weeks. Pixel art is fun but dang is it difficult. The mainly self imposed limits of it make it fun but pretty challenging. The background is just something online that I thought was neat.