black Dahlia.

A mysterious woman who is at least partly a mechanic, Black Dahlia has risen through the ranks of the Medici mob's henchmen to become one of Lorenzo Medici's top enforcers. When she's not acting as his personal bodyguard, she's sent on the most important and heinous missions for the Medici. She has worked for Lorenzo for at least fourteen years.

She trains prospective enforcers working for the Cirque des Cartes, and is referred to by Regina as her "conflict coach." [2] She is also the trainer of the Medici's legion of female assassins who dress in bunny outfits and specialize in concealed weapons, such as the foot blades used by Cerebella.

Four of these bunnies serve as his personal assistants;

The time-out assistant bunny: Bookie (JP: ブッキー Bukkī)
Shotgun Bunny: Bonnie (JP: ボニー Bonī)
The Pistol Bunny: Buttercup (JP: バターカップ Batākappu)
The Knife Bunny: Killer (JP: キラー Kirā)

In this world there is only there are abandoned cities there is no one in the world not a single person just the two of them and the air feels lighter but cold you can even hear the winds the snow is everywhere and the walls of the buildings are cold and concrete there is no animal just no insects nothing we don't know what happened but what it means is that now we are in an eternal solitude