The search results confirm the existence of the character Great Emperor in the film Space Battleship Yamato: The New Voyage, but the available information is very limited. It is known that the character serves as the leader of the Dark Star Cluster Empire, also referred to as the Dark Nebula Empire in some sources. This empire is the antagonistic force that the crew of the Yamato must confront in the film.

In the cast list for the film, the character is credited as Great Emperor, with an alternative name found in some sources being Great Emperor Skulldart. The voice actor for the character is Akira Kimura, who also serves as the film's narrator.

However, the search results do not provide any substantial detail regarding the character's background, personality, specific motivations, role in the story beyond his title, key relationships with other characters from the Dark Star Cluster Empire such as Meldarz or Deda, any form of character development, or notable abilities he may possess. Consequently, a comprehensive character description covering these requested aspects cannot be provided from the available search results.