Little boy Cloud is wimp.
As gets older, decides doesn't want to be a wimp.
Will join SOLIDER.
Becomes an MP.
Won't reveal identity to anyone at Nibelheim.
Fails to save Tifa.
Has Limit Break or goes Super Saiyan or Seph just shouldn't have acted like he was invinsible.
Gets dunked in a tank of Mako.
Jenova cells.
Poisoned.
Zack dies.
Cloud still hasn't regained thoughtful conciousness.
Tifa finds him.
He thinks he is Zack? Acts like him.
So...needs to show Tifa he isn't a wimp.
So, at the beginning of the game - its the first time Cloud's done anything thinking hes Zack, and the first time hes done anything since he has gotten the Mako dousing and Jenova Cells.
**I'm not clear on how much time Zack and Cloud spent in the Nibel Mansion basement. How long it took them to get from Nibelheim to Midgar. And how long it took Cloud to be found by Tifa. I think there are enough variables to make different time ranges all seem plausible. I forget, do those documents in the basement indicate how long ago the subjects escaped?**
Which also means that Zack had only died...what? a few days earlier? a week or two maybe? when Cloud meets Aeris. And he shows up acting exactly like Zack.
Through the game he goes several different kinds of crazy.
Reunion/Jenova Crazy.
Track down Sephiroth Crazy (separate from Jenova crazy).
Who am I/Who is Zach Crazy.
Catatonic Schizophrenic.
and Journey into the Subconcious in the Lifestream.
And then after the Lifesteam, he comes back with a new personality. It isn't any of the previous ones. So who is this new Cloud that we finish the game with?
So i guess it goes, Young Wimp Cloud, Older Wimp Cloud, Comotose Cloud, Zack Cloud, Confused Cloud, Catatonic Cloud, Mysterious New Guy Cloud.
I just finished the Ancient Temple on my current playthrough and I just found myself laughing at how crazy this character is.