Pokemon was my first real fandom, which I think I got into through being on usenet as a kid. I had an OC who was Gay's older sister, who had purple hair and was a member of Team Rocket :p I was pretty into Team Rocket. Also rivalshipping. (And honestly, my tastes haven't changed much, even if the fandoms have.) I used to make little fanshrines, which is mortifying and adorable in retrospect. I'm pretty sure these are now lost to the depths of time, although you can still find some of my early fic on ff.net /o\
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