I was about to ask if Ashton was based off Nulla from To Eat A God since he REALLY reminded me of him, but then the game saidhe was based off of stupid golf ball man (Peter YB) and I was like "Huh. I forgot about him."
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LOLOL Nulla is a million times better than spoon face gray alien man, but yes, at the time (2021 i think) it was the first yandere visual novel I have heard of (also technically DDLC) and it's what inspired Ashton. Really Ash is more based on my other favorite fictional husband Underfell San and a mix of things I personally like.