Well actually I lifted the Zulu claim from that specific post, Badger.
To be honest, I do think they are an amalgamation of African content (which complicated things, as numerous potential nations are already represented), and consider that with actual Hoplites, it would seem that one of the influences is in fact Nubian.....
Anyway, I think the penguin warriors should actually be a part of Kiwikuna, which would be a paradoxical blend of Zealand and Hawaiian cultures.
The penguins would be their sacred, amphibious shock troops, of course.
