Post an Аниме character who has killed hundreds, thousands, или millions of people.

I think the Millennium Earl from D. Gray-Man. From what I can see he has killed a lot of people throughout his time and existence as the leader of the Noah Clan. So does he count?

Light Yagami. No question.

Sousuke Aizen (Bleach)

in order to satisfy hogyoku he have taken lives of thousands and thousands of innocent people................. and guess what he was going to wipe the entire karakura town to create the ouken to get to the royal palace guarded b royal guard ........planning to take lives of the millions of people for creating the ouken the key......to the royal palace.from that u can see how cold this man is.........thanx to ichigo and kisuke they he was stopped at last..............heh ehe he e

Accelerator

Alucard has killed hundreds of thousands...

bb (Death note)

Almost everyone who live in Roanapur from Black Lagoon

Gintoki and Katsura