no they're humans we just don't see them directly
but they all are known to exist
I suggested HUMAN after that if the vessel didn’t count. Still 17.
According to the Prophecy it's a cage made of human soul and parts, basically Ship Of Thesus
HUMAN is just a representation tho
not an actual character
It is a Character that appears in Debugging and was going to be used before Frisk, and has connections to Kris’s design, so I think they count.
I personally call them The Reflection cuz that's what undercards.net calls them
they literally are humans
works cited:
Oh, some fellow humans ... like me.
I'm Orange! The ... human!
-The flowers themselves
Seth appears to be ... humans
Green is a green human ... .
This could reference Yellow being ... a human,
Blue (JP: ブルー Burū) is one of the 7 ... h ... u ... m ... a ... n. ... s.
-Wiki
well its not like clover has a different naming scheme
Makes sense, I play undercards too, the name is just literally HUMAN and that’s funny to me.
Ah yes it seems that I forgot about the forbidden quote editing technique
Then they are officially humans
A fellow undercardser 
my username there is snewgraves1 and you can find my deck in the hub, titled Reap What You Snow (with the exception of stuck tasque instead of leafling)
also they should've just ramped leafling's cost up instead of nerfing it to hell
ok I'll stop yappin