Putting a hat on a tablet has not in fact "instilled a unique personality". If that's what kid are taught I worry how they'll grow up.
I suggest checking Arvind Narayanan's tinkering with his own children. That being said not every parent is a Princeton professor working on AI so tread with caution.
Also on a pragmatic front if you want to tinker on the domain something potentially easy to setup yet relatively open https://www.home-assistant.io/voice-pe/