Question about new beast tribes (possible Spoilers)

[RukiaFae]

What i want to know is why are they called Blue Kojin when they are green? The red Kojin are red...so why aren't the blue kojin blue...

Apparently blue and green use the same word, in Japan I believe. That's why the emerald carbuncle is actually blue. I can't remember where I heard that explanation on the carbuncles right now.

Edit: Yep traditional Japanese uses the word Ao for blue and green, so that is where translation caused the issue. In Japanese they are technically green and/or blue.

Source: https://en.m.wikipedia.org/wiki/Ao_(color)