These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: Tujiro, the vampiric Kabuki dancer Arch-Enemy of the second incarnation of Grendel puts any of the masked vigilantes and crime lords to shame in the evil department. For all his evil deeds, the first Grendel, Hunter Rose, never harm children physically or psychologically. Tujiro, on the other hand is a serial killer who specializes in young boys. First he drains them of their blood while taking one of their eyes as trophies. The other he eats. Tujiro runs a human slaving operation where people are kidnapped for forced servitude and he has easy access to any child he wants. Escaping justice at the hands of the mother of a victim, Tujiro ends up as the pope in a dystopian future where thousands are worked to death and enslaved to him. Tujiro gruesomely murders those who discover his true nature and uses his position to continue his disturbing feeding habits. His ultimate goal is to create a gun to blot out the sun and establish a reign of vampires where humans are nothing but cattle.
What Hunter Rose does to Lucas Ottoman in Behold The Devil, what Tujiro does to Christine Spar's son in Devil's Legacy
For other people, Hunter's event horizon comes from his murder of Stacy's beloved uncle and public humiliation of Argent in Devil by the Deed. Both actions mark Stacy, and when she finds out Hunter's responsible, it leads to his death.
Also in Behold The Devil, Hunter manages to see his entire legacy in the future through supernatural means. He then tears the pages describing this out of his journal, causing much heartbreak later on, simply because he can't fathom anyone else being Grendel.