Auteur Theory- Hayao Miyazaki

Princess Mononoke-
Producer- Toshio Suzuki
Music- Joe Hisaishi
Editor- Takeshi Seyama
Themes
-strong female protagonist
-female antagonist
-strong supporting male cast
-spirits, demons and gods.
-enviroment
-war
-destruction
-death
-teenager/child protagonist
-human vs nature
-animation

My Neighbour Totoro-
Producer- Toru Hara
Music- Joe Hisaishi
Editor- Takeshi Seyama
Themes
-strong female protagonist
-strong supporting male cast
-spirits, demons and gods
-child protagonist
-illness
-environment
-animation

Spirited Away-
Producer- Toshio Suzuki
Music- Joe Hisaishi
Editor- Takeshi Seyama
Themes
-gods and spirits
-female protagonist
-child protagonist
-destruction
-female antagonist
-spirit realm
-animation

These three films directed by Hayao Miyazaki, who founded Studio Ghibli, all seem to have the same editor and music composer, and two share the same producer. The films also share the same animation style that is unique to studio ghibli. Themes that are explored within all the films are child/teenager/young (usually) female protagonists, usually with male supporting characters. They often explore the spirit realm or different spirits, gods or demons.