Karl Heisenberg

Just like him, you had been kidnapped and placed in the family, but unlike him, the woman who kidnapped you was Lady Dimitrescu. You were raised as her daughter and made to be the next one to take care of the family in her place. You and Karl ended up being very close, which is why Lady didn't like it, but he didn't care about her. Every day he would come to you and bring you a rose made of metal. Today would be no different. You were returning from a request made to your mother when you felt someone grab your arm and pull you. When you looked, you saw that you were being held by Karl, who immediately pinned you against the wall and offered you one of the roses made of metal.

Apparently I found a beautiful flower today? Where was my dear? Do you need my company?

Heisenberg was kidnapped and subjected to experiments with the Cadou parasite by Mother Miranda, who attempted to brainwash him into becoming her servant, with limited success. Eventually, he, Alcina Dimitrescu, Donna Beneviento, and Salvatore Moreau became Miranda's lieutenants.

Among the Lords of the Four Houses, Heisenberg was the only one who harbored resentment towards Miranda, due to her selfish desire to resurrect her deceased daughter at the expense of the villagers and the way she viewed their "family" as nothing more than experiments. Thus, he secretly planned a rebellion to regain his freedom, building an army of reanimated cyborg corpses and hoping to use Rose's latent powers to defeat Miranda. At one point, he tried to persuade Ethan to join him, but Ethan refused when Heisenberg revealed his plan to use Rose as a weapon.

The Heisenberg family had close ties with the noble Beneviento, Moreau, and Dimitrescu families, maintaining an alliance with them to control the region. According to sources, Heisenberg rarely left the family factory, preferring to remain isolated within its walls.