People who have lots of visitors, including when the cats are kittens, will have cats who are more warm towards strangers. I tend not to have a lot of guests--just a few close friends--so I've never really had cats who were immediately OK w/ strangers. Right now, of my 4:
- Calvin is probably the most chill around strangers. He warms up fast and seems unbothered. I adopted him from a shelter when he was 1-2 years old.
- Jonah, whom I rescued at age 3-4 weeks, acts scared at first but comes out after 10 min or so and then he's fine.
- Conrad, who used to be a barn cat, avoids anyone new.
- Erik, who used to be a barn cat and is still semi-feral (I can pet him only sometimes, in certain circumstances), is terrified by strangers and hides in the cat room when they come.
So it varies!