MLP FiM's original show bible leaked yesterday and I'm not gonna lie, there's some really cool stuff in there. Not sure if I can link to it without violating forum rules because after all it appears to be copyrighted material. But I think it's great stuff if you are interested in Lauren Faust's creative process while developing the show, as well as possibly what could have been if Hasbro hadn't insisted on including less of the adventure stories that Faust wanted.

So just in case I can't post a link, here are some highlights:

- Lauren Faust predicted that at least some boys would watch the show

- Many characters had different names, designs, and cutie marks. For example, "Twilight Twinkle" was colored differently and had a cutie mark resembling the flag of Pakistan.

- Twilight and Cheerilee were originally supposed to be very close.

- Celestia was supposed to be a queen (this was later changed because Hasbro believed that "queens" in fiction are usually evil).

- Unicorns were apparently supposed to hail from the mountains.

- There's a lot of concept art of things that never ended up being used, like different outfits on some characters. For example, some outfits include bridles, which have never really appeared in the final show.

- The Wonderbolts were originally called the Blue Thunders.

- There are some episode synopses, meant to give examples of adventure and relationship stories, respectively. Some of these ideas for episodes are recognizable from Season 1, while some ended up being discarded.

- Deer and seaponies were supposed to be canon from the very beginning. It's possible the unused deer episode was the inspiration for one of the comic arcs.