She acts like a 5-year-old...because she's five years old! Just because her sisters act 7 years older than they are doesn't make Bubbles deficient for acting her age!
And let's face it, Blossom is going to grow up to be the kind of person who graduates from college at 17 and finds herself at a loss for what she's going to do with the rest of her life once she finishes grad school, and in her case probably regretting that she didn't seize what made her special (her superpowers) when she had the chance.
Buttercup, on the other hand, is going to have to have some intensive therapy for anger management after spending her childhood being told it was ok to beat the crap out of anyone who got in her way.
Just sayin'.
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Now I know why.
We both have quite fierce tempers.
I was playing Undertale earlier and thinking of possible headcanon voices for Undyne and she came to mind, but as Grey DeLisle