Non-Human Personhood

All throughout Android Ash's existence he's learning what it means to act human. From the very beginning of his and Margret's communication we see that his knowledge of Ash and his reactions are incomplete. Android Ash also works harder to verbally remind Margret that his existence is only a performance, he's a computer, a program, an algorithm designed to regenerate responses that are most similar to how Ash would respond; we see this when he asks her to define the term 'jib'. We also see that when Margret mentions the lover's cliff Android Ash looks up a more accurate version and relates it back to Margret mid-conversation, something that is jarringly different from how we've seen Ash speak until this point, so it's obvious and an uncomfortable reminder that Android Ash is not only not human, but he's also not Ash. Margret immediately tells Android Ash to not do this anymore because humans are incapable of pulling information from the internet that quickly, and it doesn't fit Ash's account/established opinion of the story.
When Android Ash gets his human body we see two changes: Android Ash stops making black humor references designed to remind Margret that he's not really human and he begins to more thoroughly fill in the gaps in his programming. Android Ash's body is more than reminder enough that he's not human, his skin is too smooth, he's instructed to close his eyes and then pretend to breathe when Margret sleeps next to him, he doesn't need to eat, he's impossibly still, he constantly holds himself in a stiff position. Not only this but Margret begins to explain to Android Ash how Ash would react in multiple different situations, sexual, violent, even suicidal situations, and she becomes increasingly more violent in her interactions with Android Ash. It's obvious, even from the beginning, that Android Ash is incapable of replacing Ash, however, during the scene at lover's cliff, we begin to question Android Ash's personhood.
Immediately after Margret's explanation of Ash's reaction Android Ash reacts accordingly, crying, pleading, it's totally convincing, so convincing that despite knowing that Android Ash isn't human and isn't Ash himself, Margret can't bring herself to force and/or push him off the cliff. She keeps him locked away in the attic. All during his time with Margret Android Ash is collecting information, learning what he needs to do to act/be more human, learning what people expect of him, learning like a child how people interact and what to do in certain situations.
If Android Ash is given more time to learn/perfect his performance of personhood he may even be able to seamlessly convince those around him that he has in fact gained sentience. It's been well established that he'll never replace/be Ash, but he could develop certain habits/actions/reactions based on Ash's and create his own personality.
Unfortunately if he ever was able to achieve this, we'd never know if Android Ash really became a person or merely perfected his performance of personhood.