Nekron has been around since the '80's, first appearing in Tales of the Green Lantern Corps. He is the embodiment of an aspect of Death, not a demon from hell.
The great darkness. The Specter. The Anti-monitor. Darkseid. Trigon. The Endless (the sandman. ) . Dr Manhattaen. The lords of law and order.(Nabu.) The lords of chaos.(Mordu. ). The Phantom Stranger. The supreme ruler of different pagan gods. (zeus, high Father, etc) I would think some of them would be in the top 10. Especially the great darkness would be 2nd under the Presence. 👽👍
What of Doctor Manhattan?
first one Necron not Necro
Just like the fictional christian god, the comic god, the Presence, with all its power and ability, allows evil to exist.
It's NECRON. NECRON.
you forgot ' The Great Evil Beast' often said to be the evil version of The Presence