My female “Maine Coon Cat” has a little bit of a mane, and it’s not uncommon for the males to have a more pronounced mane.
I put quotes around “coon cat” because my cat is actually a shelter cat adoptee of no particular breeding, but she comes from New England, where the Maine Coon Cat developed among the local population, and she obviously shares a lot of genetic material with the breed.
The cat I saw had a mane or ruff very similar to the low right picture. Maybe they had a bit of Maine Coon in their ancestry.
The effect was startling because both cats had very unusual fur otherwise: they had quite short fur that was almost all undercoat - very few guard hairs. Also, from their “Egyptian Mau” side, they had some unusual spotting in their coats - unfortunately, the male moreso than the female I adopted. It gave him a very exotic look.
Actually, genetic analysis has shown that the tiny jaguarundi is essentially a dwarf puma (to the extent that they have changed the genus to Puma), but this is a wild species.