Black Rose Dragon (character)

Black Rose Dragon, is a servant of the Crimson Dragon, commonly referred to as Signer Dragons.

Akiza Izinski is the Signer associated with Black Rose Dragon and as such possess the "Black Rose Dragon" card.

Anime biography
Black Rose Dragon served the Crimson Dragon and fought alongside him and the other Dragons in the ancient battle against the Earthbound Immortals.

On the first season, Greiger states that this Dragon is a creature of ill omen that brings forth ruin and destruction. However such statement at the time had to do with Akiza being a Psychic Duelist and using her powers to manifest her Dragon for real. This in combination with the hatred and pain she carried led out a path of destruction by using this monster.