Only the PSP as of now with no digital download version.
you cant play it in the regular game but you can play in it when birth by sleep final mix comes out in japan i think the 21st of January and this game will have English voice overs
no probably not
Not really, Birth by Sleep is the earliest game chronologically, so if anything you should play that first. They're both pretty good though.
Birth by sleep is the story of Ven, Aqua, and Terra. it takes place about 10 years before kingdom hearts and it explains how the everything led to Sora's journey.
You can play as Aqua but only in Birth by Sleep Final Mix, which is only released in Japan
I don't think you can. If you really want to redo the bosses, then you have to play a new game
No PSP go can not play Kingdom Hearts Birth by Sleep because the PSP GO doesn't use a Universal Media Disc, but you can download the game (when it's released) at the PlayStation Store.
No
You get to play as Terra, Ventus{Roxas}, and Aqua.
yes
yes you can play games from other systems such as the original game boy or game boy color!
For you to understand the story and game play it's been suggested to choose Terra first.