mabye
You can play as characters from multiple final fantasy games (though not all) in games such as final fantasy dissidia 012: duodecim.
Tetsuya Nomura has worked on/drawn the characters for Final Fantasy (and Kingdom Hearts, as well as many other games).
Final Fantasy X-7? no. there is Final Fantasy 10-2 which is the sequel to Final Fantasy 10 (and is the only actual sequel in all of the final fantasy games) and there is Final Fantasy 7, but there is no Final Fantasy x-7. the games may be made by the same people but do not relate to each other in anyway other then the fact they are Final Fantasy.
Dissidia is the first FF game of its kind. There are no other games like it in Final Fantasy franchise.
No, the 'main series' Final Fantasy games are completely separate from each other, even though a few names and concepts are shared across the series. But storywise, they are unrelated, you do not need to know anything about any other Final Fantasy game.
That is entirely dependent upon the speed of the hard drive, if the other hard drive has a higher RPM, or read/write time, then yes it will.
Cloud is not a character and does not appear in Final Fantasy VIII. Cloud appears as the main playable character in Final fantasy VII, and other brief cameo appearances in other games in Final Fantasy. Also an appearance In Kingdom hearts which is non Final Fantasy.
dragon age and divinity (they have sequels so there are I and II) Risen and Arcania : gothic 4 - these games do sound a little crap but trust me they are exacually like skyrim and are mabey even better.
Since they are separated games from the other Kingdom Hearts, you'll have to buy it from online stores.
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No. The final Winter Goodwill Games were in 2000 and the final Summer Goodwill Games were in 2001.