Deadman Wonderland, Ajin Recommendations
Ajin and Deadman Wonderland experiments with entities that are features non-human attributes. The main male protagonist's life also changes one day after coming face to face with death (near-death in the case for Deadman Wonderland). From there forward, they discover startling truths about their society. Both series also focuses on various mysterious entitles with supernatural abilities. If you are interested in a thrilling series about inhuman power and dark experiments, then these two series are a choice to consider.
Both have a main character who finds out he has a rare ability and is introduced into a world of violence because of it.
Both are shounen with about supernatural powers with a dark twist on them, they both have more gore and violence than your average shounen.
The general vibe you get from them is similiar