Denji is the first real deconstruction of a shounen protagonist. When given the option of saving people and getting his cock sucked, he always chooses getting his cock sucked.
The most blatant and abusrdist shutdown of obnoxious moral fagging endemic in shounen MC numales. Is he a good character? No, but he's ripped away from worse tropes and archetypes. He's human filth, and that's extremely based.