What exactly is the connection between Cloud Strife And Sephiroth?

Answer 1

Cloud Strife and Sephiroth first meet when Cloud joined SOLDIER. (A group of warriors who protect the Shinra Power Electric Company) As a child Cloud wanted to join SOLDIER and reach his top goal... To be as good as Sephiroth. While Cloud was a child Sephiroth was the best of the best (Though later on in the game Sephiroth discovers he was not born yet made in the Shinra labs) after Cloud found out about the terrible experiments done on him (Jenova / Colamidy cells put inside him) he quit SOLDIER and joined AVALANCHE (a group against Shinra) and while that was all happening Sephiroth was becoming more and more curious about his life and finally discovered the truth... with that information he began to hate Shinra then over time he began to hate the world he learned about Jenova and adopted her as his mother he used her power to try and take over the world after that AVALANCHE focused more on Sephiroth and fought him till he was finally defeated (He had killed many people on the way... including Aerith) this is why in Advent Children Sephiroth came back again to take over the world. That is the EXACT connection of Cloud Strife and Sephiroth. Sephiroth came back in advent children cause his cells were put in that box that the dude opened and when he put it to his chest all Sephiroth needed was a body he already killed Genesis and Angeal