The decision to make Yachiyo instantly choose to cover up the crime was pure genius. Whenever she is confronted with a situation that goes outside the scope of her programming she beep booping in all the wrong directions. Freaking over missing shampoo hats, turning into a tank delinquent, hiding crimes and disposing of the bodies. I love it. They could have made her a perfect angel like 99% of doll-like robot girls but instead we get something actually interesting to watch.