OK, I just noticed the kuudere tag. Kanna-chan doesn't seem cold so much as searching for meaning and her path in life. Yuu-chan is just plain aloof and a bit of a space cadet. she isn't cold, stoic nor hard-boiled.
so who's the kuudere character?
Maybe Kuudere has been mistaken to mean "spacy and unassuming" instead of "cold and unassuming"; 空デレ - which looks like it describes a spacy/blank dere - was my first impression too. クーデレ is the actual term apparently; what are the roots?
a quick lookup implies that the kuu ( クー) part may be a play on the English loanword クール ("cool"). after reading up a bit more on the dere-types, I "suppose" it could apply to Yuu's personality because she is rather cool and collected, but that's about as far as I see the archetype applying. in fact, I'd tag her personality as dandere because she is more shy and quiet than a cool beauty type.
So anyone else have any thoughts on who the kuudere character might be?
Btw, if I have made any mistakes or am completely wrong with my explanation for the origin of kuudere, then please correct me. And if anyone is interested in where I read up on the dere archetypes, here is the link: http://deluscar.wordpress.com/2012/01/02/a-guide-to-the-deres/