Damn, I missed a few here. But just for the record I'll give Cloud-estite an above average 7, because I tend to give prop's to guys who dress up in womens clothes (but are not actually transvestites) just for the laugh, or for some crackpot idea (the case with FFVII). Why? Because it takes some guts to pass off the amount of general ridicule one might receive against the pure moments when those in the know "get it" or the initial objective is accomplished in fine style. Trust me... I speak with experience!
Actually, I'd be inclined to give Cloud-estite a 9 if he tricked out in all the optional gear.
Elena would get a 9 when she's in her suit. Probably 7 in any other attire.
So anyway, Aeris: In general, I guess she would start as a 10. When she forms an emotional bond or attachment to someone, she seems to stick by that person through whatever happens and that's big plus in my book. She always believes in Cloud even when he remains mostly nonchalant in return. She gets bumped up to 11 for being able to have fun and tease Cloud...
...but looses a point for ending up being too emotionally dependant (10) and another for wearing ty pink-on-pink (girly overdose) clothes (9).
So Aeris gets a 9 from me.
And I give myself -3 points just for trying to rationally weigh up the general worth of a fictional girly sexpot!