Being the huge Final Fantasy geek *ahem* I mean enthusiast I am I couldn't help but notice some similarities between FFVII's Cloud and Aerith and FFVIII's Squall and Rinoa, so I thought I might share my thoughts with you people.
Okay, first off this goes for FFX too, but I noticed that whenever the main hero (Cloud, Squall, Tidus) looks at the main heroine (Aerith, Rinoa, Yuna) you notice something different about their eyes. I dunno, it's hard to explain but I'll just show it.
Cloud when he first catches notice of Aerith in AC

Squall when he first sees Rinoa on the dance floor

and Tidus as he watches Yuna perform a sending

Is it just me or do they all have the same kind of expression, especially in their eyes. It almost looks like (to me at least) like they are falling in love with the person. Again something I thought was funny :3
Cloud's look when he finally sees Aerith in AC

and Tidus when he first sees Yuna

Didn't Nomura say that Cloud shows his emotion in his eyes a lot in AC? And the only time we really see this much expression is when he is looking or thinking about Aerith.
Another thing: Cloud and Squall are very alike in some ways. Cloud at first claimed that he didn't care about the Planet or helping Barret and Tifa, saying he was only in it for the money. As seen here from screencaps from the game:
http://i61.photobucket.com/albums/h72/turk...fmv3566-178.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3566-273.jpgSquall as everyone knows who played the game, was even worse. He basically didn't care about anyone else, and acted even more like a jerk, saying "Whatever" every second word.
Cloud even acted this way around Tifa. When she asks him about their special promise at first he doesn't remember it, and then when she reminds him he blows her off.
http://i61.photobucket.com/albums/h72/turk...fmv3568-171.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3568-180.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3568-286.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3568-292.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3568-295.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3568-308.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3568-312.jpgSquall acts the same way to Quistis when she tries to tell him her feelings.
http://i61.photobucket.com/albums/h72/turk...fmv3593-488.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3593-498.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3593-507.jpgBut! Amazingly ... lol ... Cloud even though he claimed he was only in it for the money, accepts to be Aerith's bodyguard for a date! Not only that, he keeps claiming he is Aerith's bodyguard even though he hasn't received any form of payment yet.
http://i61.photobucket.com/albums/h72/turk...fmv3570-174.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3591-158.jpgSquall also calls himself Rinoa's Knight, Rinoa does not ask him, like Tifa
had to ask Cloud to be her knight in shinning armor, which he reluctantly agrees to.
http://i61.photobucket.com/albums/h72/turk.../fmv3742-65.jpghttp://i61.photobucket.com/albums/h72/turk.../fmv3742-70.jpgOne more thing: Both Cloud and Squall only show their inner feelings when they are with Aerith and Rinoa. Both of them are closed off on the inside, but both Aerith and Rinoa are not, they are very open with their feelings. Tifa and Quistis are the ones who are more shy and reserved with their feelings, unable to show Cloud and Squall how they really feel.
Cloud's words on Aerith:
http://i61.photobucket.com/albums/h72/turk...fmv3570-582.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3627-348.jpghttp://i61.photobucket.com/albums/h72/turk.../fmv3667-90.jpgSquall's words about Rinoa:
http://i61.photobucket.com/albums/h72/turk...fmv3742-121.jpghttp://i61.photobucket.com/albums/h72/turk...fmv3742-204.jpgInteresting coincidences? I think not. I think that Cloud and Aerith and Squall and Rinoa purposely have similarities just the same as the main heroes and heroines from VII onward. At least that's my 2 cents ...