Muppet Babies appeared on our porch in early 2020, joining the colony of around a dozen cats already living on our property. It was easy to notice how relaxed he was around other cats even when food was being served. Once I accidentally stumbled near him and he didn't bolt, just crouched slightly and waited to see what I'd do. Within a day he let us pet him, and since then he's been alternating between our front porch and our back yard for several months.
It's obvious that he was once a housecat. He is always trying to sneak inside the house when we're not looking. When he succeeds, we try to herd him back outside, but he just plops on the ground like a sandbag and goes limp. We've picked him up a couple times to place him on the porch again, and he complains. When we've allowed him to come inside, he just lies around and watches us.