Mononoke Hime, Hoshi wo Ou Kodomo Recommendations
The under world for "Hoshi wo Ou Kodomo" is very similar to the world of "Princess Mononoke". The detailed payed to the art work is spectacular and the story line is a darker children's tale.
Both anime - a fantasy, with atmosphere of romanticism and adventures where people co-operate with gods. Well and of course plotting in this work of Makoto Shinkai is too similar to an anime of Hayao Miyazaki.
Both movies have incredibly similar atmospheres and basic plot lines about humans trying to be/control gods and not fully understanding what they're getting themselves into. Princess Mononoke delves much more heavily into a humanity vs nature theme, while Children Who Chase Lost Voices focuses more on how people cope with death. Both are gorgeous beyond belief and if you like one you will undoubtedly enjoy the other.
The fantasy creatures that lie within as well as the normal pet-like animals themselves have the same feel as the and design idea as the ones in Princess Mononoke!