No, Jenova is an alien from outerspace. Kefka and Ultimecia are both wizard/witch.
That could be an opinion but I'd have to say Sephiroth. It is an opinion and it's usually between Sephiroth and Kefka. Personally, I say Kefka because while was sane and compassionate until he became Jenova's puppet, Kefka was working of his own free, deranged will. Kefka just likes destroying things, Jenova/Sephiroth wants to kill off humans.
No.
No, they are from different games and have nothing to do with each other.
Sephiroth's father is Hojo, a famous scientist who is in Final Fantasy 7 and Final Fantasy 7 Crisis Core, and his mother is Lucrecia Crescent, who worked with him on the Jenova project.
Kefka Palazzo was created in 1994.
No... Only Chuck Norris can defeat Kefka
jenova is character from final fantsy VII
Maybe, this can be tested in FF Dissidia but i am certain kefka would win.
No.
helll no....edea isn't even the main sorcerer in ff8 ultemicia is....an niether one of them could take jenova.... jenova in her complete form would demolish everything an anything in her way.. u got to remember in ff7 you dont fight jenova in her complete form....its always in parts, jenova life, jenova death jenova rebirth ect.... put her together completely tho an no final fantasy character stands a chance
Kefka.