Schedule Slip: As of this writing, updates are much less frequent than they used to be. According to the creator's deviantARTblog, this is a result of Artist Disillusionment kicking in. As of March 2013, at least, it has becoming slightly regular again.
Humon frequently makes journal entires giving details about the characters, but also tends to delete them shortly afterwards because she likes to let the viewers find out about the characters themselves, not by some Informed Abilities.
Also, there's much debate about the sexuality of the characters. So far, the only confirmed facts are that Sweden is gay (currently in a relationship with nearby island nation Åland) and that Finland is straight (in an on-again-off-again relationship with Sister Sweden). She also stated that she does not think the characters are actual embodiments of the countries like in Axis Powers Hetalia, but more the personifications of the inhabitants of those countries.