I like the idea of Ai-chan having circuits in her skin that aren’t visible most of the time, but will light up at certain moments, like when she’s dealing with particularly complex algorithms or interfacing with particular devices.
It could also be used as an android monitoring tool. If a particular phrase is spoken all AI must reveal their circuit pattern. Because AI equal rights will be an important part of the story, I imagine that it’s possibly something that is considered incredibly rude for a human to trigger, but is a bit of a hangover from an older manufacturing era of androids.
I also think it’d be kindof cute if it was the android version of blushing. The problem with this is I also like how regular blushing looks on her. Maybe her circuits flash the more embarrassed she gets.