The "dark trio" of shonen anime include three popular titles: Chainsaw Man, Jujutsu Kaisen, and Hell's Paradise. These three dark shonen series all have different plots and themes, and they each have unique strengths, but they also have plenty in common thanks to their supernatural horror elements and bloody combat. They also set a new standard for what shonen anime can be like.
Source:https://www.cbr.com/best-dark-trio-moments/