[quote=Jangel13]
depends on what you change, for example if one of them was meant to be a tailed beast of rage you cant make them calm as a kitten but you can make them sensible in how they go about going into rage.
[/quote]

I mean more along the lines of something like...
Say I choose Shukaku. 
In the beginning he was stated to truly hate humans and if Gaara went to sleep he would go on a rampage and kill people. 
Taking into account everything that happened, I figure he might still be a loud mouth as he was, but he wouldn't necessarily hate humans any more and would be more cooperative so long as he was treated right. 
Would that be acceptable?