BullBlack was a Black Knight who sought revenge against Captain Zahab for the destruction of the planet and the death of his younger brother, Krantz. Although he fights the Space Pirates Balban, he is not an ally of Gingamen as BullBlack is willing to sacrifice innocent lives in order to have his revenge.
BullBlack was a character with a certain honor and a good heart. However due to his planet being destroyed by Captain Zahab and his brother being killed by him. With that BullBlack was obsessed with revenge. However, when he sees his brother's spirit, he soon becomes an ally of the Gingamen.