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If you've read or watched Kuroshitsuji, then you may know who Snake is, but what is he exactly?
Is he actually a natural born human-snake hybrid? An experiment or homunclus? A human with a one-of-a-kind condition? Let us go through each one and I'll tell you which I think it is.
Human-snake hybrid?
We don't much about his past or origins, but I can say this is proven false. In Snake's flashback, we can see him being exploited by an unknown circus. Two viewers, a father and son, came to see the snake man. The carnie decieves them by stating his mother was a human and his father is a snake, pointing to a random one.
Snake confirms this as a lie, that he has no father and his mother is later revealed to be Sarah Kemble, a famous actress known for her performances in Shakespeare, most notably Lady MacBeth.
An experiment in the womb/homunclus?
He couldn't have been artificially created in a lab as he was naturally born. However, his mother could've been experimented on and had her womb/the fetus injected with something like a snake's DNA.
Child experiment?
Is it possible he was a normal child that was experimented on? I mean, considering Finnian's backstory, technology and science being more advanced, and the themes/subjects explored in Kuroshitsuji, this theory isn't far-fetched. He could've been kidnapped off the street or from an orphanage as someone else suggested and/or experimented within it.
A human with a condition?
It is possible that Snake could just be a person with a rare condition, mutation, or disease that only he has. Being able to understand snakes and being able to be do things like them is probably a skill or being conditioned by the same people that exploited him.
What do I think?
I personally think that he's a human with "exotic features" like any other freakshow as his. However, I think his appearance has been modded or altered surgically/in other ways without his consent by a shady doctor. Like, cutting his tongue, sharpening his teeth, making his eyes more cat-like, modding his scaly skin, etc.
Why? For his unique appearance to be even more exotic in order to bring in an audience, selling this image of a one-of-a-kind snake man.