So, let's start a betting pool. By the end of the series before they all fuse into one or something, how many Karins will there be.
I am guessing atleast 8, one for every cardinal direction.
Quantum entanglement multipregnancy.
Addition:
Nevermind, just noticed the actual volume art.
There will atleast be seven (and one for the og unsplit Karin).
So the next one is short haired and loose wearing one, so tomboy Karin?
The fifth one is bit hard to guess, cause all we can see is the green hair ribbon tying up the ponytail.
The Sixth one also is bit hard to guess, since all we have is the mullet cut to judge by and I doubt she is McGyver Karin.
And last but not least is TSUNDERE Karin as the seventh.
Maybe vol. 2 will bring another set of seven...