For Cloud we have:
-Cloud gaga over Tifa when he was a kid - and failing to help her
-Cloud promising Tifa to be her knight and always save her
-Cloud wanting to be a Soldier to impress Tifa
-Cloud being ashamed to have not make it, thus hiding from Tifa when he came back to Nibelheim
-Possibility of him stealing Tifa's panties
-CloudZ changing upon meeting Tifa in Midgard, so he could look like the hero he wanted to be for her
-CloudZ giving a flower to either Marlene or Tifa
-CloudZ saving Aerith from the Turks
-CloudZ saying Tifa's his girlfriend
-CloudZ saving Tifa from Don Corneo - and having to dress as a girl for that XD Your pride, Cloud, it's gone XD
-CloudZ going on a date with either Aerith or Tifa
-CloudZ grieving for Aerith's death
-Cloud - I think it was him surfacing at that moment? Not sure, please halp XD - telling Tifa only her actions/opinions mattered to him
-Cloud calling out for Tifa in the Lifestream/opening his heart to her
-Cloud spending the last night with Tifa
-Cloud saving Tifa from falling in the Lifestream
All of these, just from the FFVII XD The bold line is probably the most important thing, because it is carved in Cloud's mind. CloudZ represent him being Zackified thanks to Jenova. The italics are upon the player's choice. I probably missed a lot of "cleriths" points, but that's what struck me when I played years ago