So let me get this straight; you found the guro fanfic on ED first, and then decided to look for more and you thought the non-guro fics were "weird"?
Anyway, I don't really know because I don't go on FF, but I don't think it's "just" the bipedal thing.
- elegant ballroom gown
- long, slender, white legs
- often considered to be the female counterpart to Gallade
- known widely for their loyalty to their trainers, even to the point of sacrificing their own life for them
Oh, and I don't think a Gardevoir would appreciate being called a beast.