In Tokyo Ghoul, the titular ghouls look like human beings, but they're from a totally different world. Ghouls must consume human meat to survive. Ghouls are physically stronger, can regenerate, and have deadly weapons known as kagune. That said, the more a ghoul eats, the stronger its kagune becomes.
Source：https://www.cbr.com/tokyo-ghoul-highest-rated-ghouls-ranked/
