There really isn't one each Final Fantasy game has its own different heroes and villans except maby in Final Fantasy 10 and 10-2
Kefka and Ultimecia are two separate villains from two separate games Kefka is the main antagonist of Final Fantasy VI and Ultimecia is the main antagonist in Final Fantasy VIII.
They are many Final Fantasy games for different platforms there are 14 main games at the moment each game follows a different story line. Final Fantasy XIV the newest game is a online game so is final fantasy XI.
main character final fantasy tactics : ramza
They're together in the Dissidia games, and some of the Kingdom Hearts games too, but never main series Final Fantasy.
The main villain in Final Fantasy VII is Sephiroth
No, characters from the different 'main' Final Fantasy games are not related to the ones in others. They are totally different worlds and universes.
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.
The main character of Final Fantasy V is Bartz Klauser.
The main villian in Final Fantasy 7 is Sephiroth.
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.
Final Fantasy VIII has gunblades. The main character and his rival have them.
None of the story lines of the 'main' Final Fantasy games go together, they are stand-alone games. Instead, the stories of the main games are continued in spin-offs, like Final Fantasy X has X-II for the PS2 and then for the DS there is XII Revelent Wings or something like that. Thank you for fixing that. I couldn't think of a better way of saying my answer so I just did the best I could.