I’ve seen Atsuko Chiba as a “father’s daughter.” It’s a psychological term for a woman who regards her father as the archetypal hero, and this kind of person tends to be very particular about “following an example.” Atsuko Chiba, too, is the kind who prioritizes “what she’s supposed to do”, suppressing her desire of “what she wants to do.”
Because of this, she thinks she lacks emotions, or it’s more like she finds it difficult to express her feelings. And as a result, she doesn’t know how to express her feelings in romantic relationships where a gush of emotions is supposed to be seen.
I’ve thought that Atsuko Chiba’s personality careening to the extreme stimulated Paprika’s emotional, wild side, and as a consequence, the two lost touch with each other and ended up splitting. But this doesn’t mean one is good and the other is bad—it’s the balance that is important, and both sides are to be blamed for not maintaining it. The big image of a woman that is reborn at the climax is indeed the mature version of Atsuko and Paprika integrated.