That's interesting. Do you have a link? I'd love to learn a bit about it.
As far as i remember kappa is a kind of water demon in japanese folklore that drown their victims. You know that google is a way better resource than any of us ;)
Now on the issue of that sentence happening i guess it is because of a greek source related to the game "League of Legends" where the term kappa is used. Don't know more than that (don't play the game) but my assumption is that :)
Funnily enough, the very first sentence i got when i started this course was something like this (Το κακο κ)
The Japanese kappa loves cucumbers, so if you're planning on walking down at the docks late at night, bring some cucumbers. If you give it to them as offerings they might just spare you ;)
We are simply trying to introduce words into the vocabulary. There is no reflection on how good or bad the letter is. Quite simply we tried to give a word that would seem easy to learn while resembling the letter we are teaching.
Yes, the good kappa lives in rivers in Japan. But, it's only good if you bring it cucumbers as offerings. Kappa loves cucumbers XD
It is but there is some weird bug in the system that does that sometimes. We're trying to resolve it.