Shiro

Shiro is a childhood-friend of Ganta and the original Deadman - The Wretched Egg.

Personality
Shiro is a bubbly, happy girl that seems to be a klutz. She also has a lot of energy, although her mind cannot understand much. While she doesn't fully understand Deadman Wonderland, she knows how to help Ganta and only wants his happiness. She is incredibly strong, however dense she is, and uses her strength to help Ganta as much as possible. Eventually she managed to force her body into using her Branch of Sin, which appeared to be similar to Ganta's "Ganta Gun".

The Wretched Egg, on the other hand, is almost the complete opposite. It doesn't speak much, if at all. To it, killing is a fun game, and during this game it wears a Cheshire grin. Its powers are unrivaled and were the cause of the large earthquake that hit Tokyo so long ago. Later on it is revealed that its wounds heal at a miraculous rate, making it seemingly impossible to kill.

History
Before Ganta's trip to Deadman Wonderland, Ganta and Shiro played quite often, sharing a common admiration of Ace Man, a gundam-like cartoon hero. Shiro was a subject of Ganta's mother, so they saw each other often. Although they hated each other first, they once bickered so violently that Ganta took his toys and ran away from the hospital. Soon after, he came face-to-face with a rabid, vile dog. Ganta dropped to his knees in fear and called for Ace Man to save him. Suddenly, Shiro appeared in between Ganta and the dog, saving his life. After this ordeal, they began to slowly become friends.

Wretched Egg
Shiro's split personality the Wretched Egg, also known as The Red Man.The Red Man is the cause of the Great Tokyo Earthquake ten years ago and he is also responsible for the Nagano school massacre.