Some people can be amazing in the way they’d choose to kill other people.
Like Gilles de Rais: In his own confession, Gilles testified that “when the said children were dead, he kissed them and those who had the most handsome limbs and heads he held up to admire them, and had their bodies cruelly cut open and took delight at the sight of their inner organs; and very often when the children were dying he sat on their stomachs and took pleasure in seeing them die and laughed”
Or my personal favorite, H. H. Holmes: After the completion of the hotel, Holmes selected mostly female victims from among his employees (many of whom were required as a condition of employment to take out life insurance policies, for which Holmes would pay the premiums but was also the beneficiary), as well as his lovers and hotel guests. He tortured and killed them. Some were locked in soundproof bedrooms fitted with gas lines that let him asphyxiate them at any time. Some victims were locked in a huge soundproof bank vault near his office, where they were left to suffocate. The victims’ bodies were dropped by secret chute to the basement, where some were meticulously dissected, stripped of flesh, crafted into skeleton models, and then sold to medical schools. Holmes also cremated some of the bodies or placed them in lime pits for destruction.
Or my friend Emilio, who likes Leonarda Cianciulli: Cianciulli offered her a glass of drugged wine, then killed her with an axe and dragged the body into a closet. There she cut it into nine parts, gathering the blood into a basin. In her memoir (titled An Embittered Soul’s Confessions), Cianciulli described what happened next in her official statement:
Aren’t serial killers fascinating? :D