How each Final Fantasy VII Character will most likely die.

Cloud:
Looking into the sky, he begins to hallucinate that Aeris is a
small distance ahead of him. By the time he realizes it's an illusion,
he has one foot over the cliff, and plummets to his doom.

Tifa:
Tifa might just run after Cloud, or from her back breaking from her
. . how shall I say, upper burden.

Barret:
Barret will either one day accidentally shoot himself in a limb
and bleed to death, or have an incident because he only has one hand.

Aeris:
Of course, she is stabbed through the chest by Jenova herself,
or by controlling Sephiroth or a clone. Of course, I doubt it is
Sephiroth himself, because he's frozen in the crater in suspended
animation from Cloud stabbing him in the back.

Cait Sith:
Well, obviously the plush toy is immortal, but whenever Reeve dies
is when the plush doll ceases to function.

Nanaki:
I don't think he will die, but if he does, it will most likely be
for a reason that his father sacrificed himself. (Of course, you never
find out how long his race can live, so I assume it's infinate, or
I could just add he could die of old age . . *shrug*)

Yuffie:
She, of course will either be caught stealing, or die trying to take
an offering of materia from someone.

Vincent:
Tough to decide . . he'll either live forever, or die in a rage when
he takes the form of one of his beasts.

Cid:
Another toughy, he'll probably get killed because of his mouth, but
this may be changed if he gets together with Shera, in which he would
die of lung cancer.