@manga_follow_75743857 So far most of the shadow-living doll pairs are shown with mostly polar opposite personalities though. I.e:
Mia - friendly, nice vs Sara - mean, arrogant
Shaun - smart, restrained, vs John - dumb, carefree
Ricky - confident, cunning vs Patrick - irresolute, naive/sheltered
Etc
Since Kate is a special morph, I guess her imitating Emilyko's intelligence doesn't apply because Emilyko, while quite observant and quick-witted, is pretty airheaded most of the time. I guess to some extent, the morphs learn to counter/complement the living doll's personality to be able to get along better, just like a child to parent like you said.