Black.
His full name is Zack Fair.
Zack is 16 when Crisis Core begins and at the end he is 23.
Sadly, no. You can only use Zack Fair.
no, its a video game for the playstation portable
Shin-Ra Electric Company, or SOLDIER to be precise.
yes
Zack died in the outskirts of Midgar.
Angeal
Zack is described in Crisis Core as "restless like a little puppy" and having "zero attention span." During the beginning of Crisis Core, he's restless and aggressive, always wanting to see action. He settles down a bit after Angeal's death, but retains his optimism and off-the-wall creativity.
Zack Appears in FF7, FF7 Crisis core and FiF7 Before Crisis(not released in the US) The prevailing rumour is that the game will be released on Sprint mobile phones; it has not been verified.
By running out of hp.
Sadly, in Crisis Core you can only control Zack in the game. Crisis Core seems to break the Final Fantasy mold and unlike Final Fantasy VII, the game is completely centered around the main character.