User blog comment:Menara/Bianca di Angelo may be one of the 7/@comment-204.10.222.23-20110912163318/@comment-4410682-20110914223855

Well, Nico was never really accepted at camp until the end, and Bianca just..died, so we might have just never had the chance to see a Hades kid be happy, also considering there were only be two. Pluto children might "smell" different as well.