Author has written 26 stories for Invader Zim, Manhwa/Korean Comics/만화, Fairy Tales, Haruhi Suzumiya series, Harry Potter, Ouran High School Host Club, Discworld, Spirited Away, Portal, Kuroshitsuji, Buso Renkin, Misc. Games, Host, Homestuck, Gargoyles, Five Nights at Freddy´s, Lord of the Rings, Steven Universe, ManHua/Chinese Comics/漫画, and Soul Eater.
Because writing fanfiction is akin to an art student repainting the works of the great masters.
Also, because it's fun.
Some might say that the internet, this site in particular, has ruined literature for everyone.
Well, I agree that it has cheapened it, but why on Earth would that be a bad thing? No longer is a work of fiction something commissioned by a patron and designed to appeal to the masses. Now, fiction can be used casually (sometimes, admittedly, without grammar) and for no other purpose than to have fun.
Point is, I like fanfiction, you like fanfiction (at least I hope you do, since you're on this site), so let's all have fun and enjoy ourselves, regardless of dissenting opinions.
My online HQ is currently on Tumblr.