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If I were to imagine her introductory episode, I imagine it'd start like this
>One day Asimov randomly finds this little girl robot following him around, shows up next to him at the bus stop for school
>She says she's his little sister, other kids are like "Dude I didn't know you had a little sister"
>Asimov has no idea where she's from, Maria doesn't either and wonders for a moment if one of the Asimoms somehow managed to give birth after some "guests" visited last week
>Until he can solve the mystery Asimov decides to treat Ada as a sister, cue shenanigans as she causes trouble around school and town
>Ashley gets super jealous and is convinced that Ada is secretly an alien or robot or something, ropes some of her friends like Dorothy into spying on her throughout the day
At some point down the line Asimov 2 would reveal himself in some capacity and his involvement in Ada's creation and try to use her as leverage to push Asimov to joining him by appealing to his love for family.