No, they're totally unrelated characters. Any confusion would be down to Squall taking on the name 'Leon' (from his surname) in one of the Kingdom Hearts games.
Yes, you can also see him in Kingdom Hearts 1 and 2. Leon is Squall from FF8. Square-Enix + Disney changed his name because Squall is hard for little people to pronounce, the people who play Kingdom Hearts XD
They're together in the Dissidia games, and some of the Kingdom Hearts games too, but never main series Final Fantasy.
same as Dissidia, there is none. none of the main numerical Final Fantasies have ANYTHING TO DO WITH EACHOTHER. the main hero is the main character for that game 7 = Cloud, 8 = Squall, etc. Signed, Phoenix
No.
Yes, Seifer Almasy and Squall Leonheart grew up in the same orphanage as each other, and though they forgot this due to the effect of using Guardian Forces, they also knew each other at Balamb Garden, where they were rivals in the art of gunblade fighting.
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.
the spirit within is made by the same maker of the final fantasy video game series even though its a stand alone film
How does one really answer that in a way that will be the same for all gamers? What do you mean by "better"?
There was a Sora in Final Fantasy II but not the same Sora from Kingdom Hearts.
Eternal Legacy and Final Fantasy III.
No. There's not a Crisis Core sequal, but the continuation of the story called Final Fantasy VII.
If i beleave rightly the damage limit in final fantasy 12 is 99,999, that is the same for ff10 and 10.2. Wereas final fantasy 1 - 9 is 9,999. Hope this helps.