4. Ganta, like many other prisoners housed at Deadman Wonderland, discovers that he is a 'Deadman', one of a group of prisoners with a very special power. What power do the Deadmen all have in common?
From Quiz Welcome to Deadman Wonderland
Answer:
The ability to use their own blood as a weapon
The ability to manipulate one's own blood is known as a Branch of Sin. It is caused by a parasite, the Nameless Worm, that lives in their bodies. When the Great Tokyo Earthquake occurred a decade before the series started, the Nameless Worm spread across Tokyo. In Ganta's case, he learns to form bullets out of his own blood.
Other notable Deadmen in the anime are Senji Kiyomasa, who forms blades out of his own blood; Minatsuki Takami, who can create blood whips attached to her hair; Karako Koshio, who uses her blood as a kind of armour; and Nagi Kengamine, who creates blood bombs. The manga also features Chaplin Sukegawa, a trans woman who makes thorns out of her blood, and Idaki Hitara, an old man who can set his blood on fire. The Deadmen live on G Ward, isolated from the rest of the prisoners.