(Sorry for any punctuation errors out there you Grammar Nazi's)... So, if you are wondering what D.D. stands for, it stands for Daresome Duo. Who’s in the Daresome Duo? Well, two kids, a 12 year old brother and a 12 year old twin sister, called Jason (Also known as Hippo-Man) and Emerald (Also known as. . . Emerald) who just happen to be superheroes...All Rights Reserved