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I chose Godzilla as my first online username. My friend chose Dracula. It was probably 1999.
At the time, I thought Godzilla in the '98 Hollywood version was the coolest creature ever. I really wanted to be a dinosaur so I could be just as cool and show off to the big kids in school so they would never bug me anymore.
I largely stopped using it a long time ago, but I'll always be 'zilla to those who remember.