I am pretty sure I was a BNF once in an anime fandom that enjoyed a few years of hyper popularity, at least among LJ/FF.N circles. That is, I was told I was a BNF (which is how I ever first heard the acronym, lol). I guess I unlocked this achievement by writing loads of slashfic for the most popular ship, and also I was super active on the LJ comms because I was ridiculously obsessed with the series in question, so engaged in and instigated a lot of series discussion. My fics would get hundreds of reviews, even the one-shots, so that was pretty cool. I even still occasionally get reviews from them even years later, which is always a bit nostalgic. I ended up making pretty good LJ friends with several of the other people who were really active in discussions/wrote a ton of fic, so that was fun.

I can't say I was ever really involved in any drama. I think there was a time or two when someone random would get aggressive toward me, but nothing too crazy. I don't think I'll ever be a BNF again because I don't have tumblr and don't have the time to write much fic, and I don't think I have it in me to get quite as obsessed about a series anymore. But the experience did give me more confidence in my writing, so inspired me to start writing original stuff.