While I agree Berry has a lot of elbow room for her background to be developed, the problem is people often WANT their to be something more to a character then there actually is. For all we know, a lot of the IFs there could have backgrounds that pose similar problems or situations that shaped them into who they are.
But in my opinion, I really don't think ANYthing the IFs go through will 100% change who they really are. Wilt may have been more care free back in his older days but comparing how he is now to how he was then, he wasn't that dramatically altered. He's changed yes, but not that much when you consider his personality and the way he acts.
Look at Red, the only thing he shared with Terrance was his stupidity. Red was born to kill Bloo and smash him yet Red doesn't have a mean bone in his body in truth. Didn't matter what Terrance said or did, the fact is Red is the way he is and no matter what he was told or forced to do, his true personality became evident.
Berry to me is and will ALWAYS be the obsessive, psycho, crush, maniac little pink blob she's always been. My only speculation about her past is that she was given up BECAUSE of her personality, that she became too insanely obsessed with her creator or that creator's friend, or dog, or mom or whatever. I see absolutely zero remote possibility she was "abused" or hit.
Imaginary friends in truth, don't really change, none of the IFs in the main or miscellanous cast have completely departed from their basic personality functions. We've been with Bloo since the beginning and while he has show signs of change a few times, majority of the time, he is still the same old Bloo. Same with Wilt, same with Eduardo, and same with any other IF.
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