I find fan-fiction to be good practice for different styles. Sometimes you want to try out a new way of writing, or just see if you can write a proper story. Using your own characters for that sort of thing is great, but while you are obsessed with a certain universe, and it happens, it's difficult to write an original piece, and even if you do, you'll look back at it later and hate it for stealing stuff from other things, which is ten times worse then openly writing about someone else's world.
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