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I was late joining LJ (relative to most of my friends at least) and when I tried signing up, about the first twenty potential usernames I tried were already taken. Eventually I tried the name on the label of the cuddly toy sitting on my desk...

It's worked well enough as a username; it's not easily linked to my real name and it's memorable, although it does make me sound like a teenager. I like the fact that there are lots of free icons which work well with this username. Sometimes I consider changing it to something more grown-up, but overall I've grown to like it.