system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord of the Rings] Across all of time and all of Middle-Earth and across all officially licensed LotR media, who has the highest personal death toll?

EDIT: Some people seem to be misunderstanding what I mean by "personal death toll". By that I mean how many people has that individual personally ended the life of. Like, with their own two hands. So most leaders/commanders probably won't qualify unless they were out on the battlefield killing scores of soldiers.

Commands don't count. It needs to be the person that does the killing.
gpt
Eru. Hard to beat sinking an island the almost twice the size of the UK. 

If we aren't counting literally god then it's hard to say.   Any elf warrior has probably slaughtered huge numbers of orcs, you can do a lot of killing when you're immortal.