User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4902593-20130914145422/@comment-1411267-20130917105202

You don't look at Nico properly Kronos. For one he is possibly, the most alone out of all the characters. He has lost his entire family (lets not count his dad because... well the gods are never the best of parents) He has no family to help him through. Percy has always been able to fall back on his mom for support. Thalia has her sisters in the hunters. Nico has no-one. The feeling of being truely alone, is something kids across the world can relate to. So already you have a character who tons of people can connect with.

Then add it to all we have learned about Nico and who he is. Nico wants acceptance, he wants a family. We have seen this throughout the whole series, as he betrays his friends in order to gain acceptance from his father. He breaks the rules of nature in order to bring back his half sister.

We have also seen him go from a cute, clueless kid. To a dark, depressing, and tragic character who is years beyond his age. And considering he is a secondary character... his development in the series is only surpassed by Percy, Annabeth, and Luke. None of the other 7 have had the kind of development he has had (granted... the seven have had less books to develop)