@Snakeykid1
i forgot too but "sari" first appeared in chapter 17. dali disguises himself so he can study in the school library but migi falls in love with the disguise. he ends up using it to trick migi into studying harder, they end up going on a date and sari tells migi that shes moving to a...
Pretty sure brains being implanted into robots was mentioned during that arc with all the people with prosthetics. Wouldn't be surprised if thats what the directors had done by this point.