I think this culture is frankly amazing. I love how in the direct, they even state why the shop owners are the way they are, and why the inklings love them. I also love that the multiplayer music is sung by Callie and Marie, and that's the way everything is. In single player, it also seems the octarians have their own superstar that sings the vocal tracks as well.
I love that the attention to detail is so great, that we can look at their culture as their own entity. I just find it amazing....
Though I do wonder about one thing.... Besides the shop owners and the like, where are the inkling's parents? Is Inkopolis a teen only zone whilst the parents stay at home?
I think however, that this will all be explained in Single Player's Sunken Scrolls.... Or at least... I hope...