My choice for the award isn't on the above list. It is someone that many Bible believers have never even heard of.
His name is Jehu.
The story of Jehu is told in 2 Kings chapters 9 and 10, where God, through the prophet Elisha, anoints Jehu as king and commands him to perform a series of serial killings. First he is told to kill everyone in Ahab's family, especially all those who have ever "pissed against a wall."
Thus saith the LORD God ... thou shalt smite the house of Ahab ... For the whole house of Ahab shall perish: and I will cut off from Ahab him that pisseth against the wall. 2 Kings 9:7-9So Jehu rides off in his chariot to kill Ahab's son, Jehoram -- a wall pisser if ever there was one.
After killing Jehoram, Jehu killed Ahab's wife, Jezebel, whom God wanted not just dead, but treated like shit and fed to the dogs.
And the dogs shall eat Jezebel in the portion of Jezreel, and there shall be none to bury her. 9:10So Jehu had Jezebel thrown off a wall to be trampled by horses and fed to the dogs.
This is the word of the LORD ... dogs [shall] eat the flesh of Jezebel: And the carcase of Jezebel shall be as dung upon the face of the field. 9:36-37
Then it was time to take care of the rest of Ahab's family. So Jehu ordered the rulers of Jezreel to cut off the heads of 70 of Ahab's sons and deliver them to him in two baskets.
But there were still a few other wall-pissers on God's hit list. So Jehu searched the town of Jezreel for any and all of Ahab's remaining family and friends -- whoever was associated somehow with Ahab and might have pissed against a wall at one time or another.
So Jehu slew all that remained of the house of Ahab in Jezreel, and all his great men, and his kinsfolks, and his priests, until he left him none remaining. 2 Kings 10:11But there were still more of Ahab's family to kill. (Ahab had a very large family.) So Jehu drove off to Samaria to meet with the family of King Ahaziah of Judah (a relative of Ahab).
It was a short, productive meeting. Jehu had only one action item: kill all 42 attendees.
Jehu met with the brethren of Ahaziah king of Judah ... And he [Jehu] said, Take them alive. And they took them alive, and slew them at the pit of the shearing house, even two and forty men; neither left he any of them. 10:13-14There were still a few more of Ahab's relatives to kill, however. So Jehu and a very close friend show off their "zeal for the Lord" by slaughtering the rest of Ahab's family.
When he was departed thence, he lighted on Jehonadab the son of Rechab coming to meet him: and he saluted him, and said to him, Is thine heart right, as my heart is with thy heart? And Jehonadab answered, It is. If it be, give me thine hand. And he gave him his hand; and he took him up to him into the chariot. And he said, Come with me, and see my zeal for the LORD ... And when he came to Samaria, he slew all that remained unto Ahab in Samaria, till he had destroyed him, according to the saying of the LORD. 10:15-17And finally, after Jehu finished killing Ahab's family in Samaria, he called an assembly to worship Baal. Then when the worshipers arrived, he killed them all.
Jehu said, Proclaim a solemn assembly for Baal. And they proclaimed it. And Jehu sent through all Israel: and all the worshippers of Baal came, so that there was not a man left that came not. And they came into the house of Baal; and the house of Baal was full from one end to another. ... As soon as he had made an end of offering the burnt offering, that Jehu said to the guard and to the captains, Go in, and slay them; let none come forth. And they smote them with the edge of the sword. 2 Kings 10:20-25And that's all the Bible says about Jehu. Still it seems enough to award him the title of the worst person in the Bible.
But what about God? Since he ordered the killings, isn't he even worse than Jehu?
And the LORD said unto Jehu, Because thou hast done well in executing that which is right in mine eyes, and hast done unto the house of Ahab according to all that was in mine heart, thy children of the fourth generation shall sit on the throne of Israel. 2 Kings 10:30Well, yes he is. Richard Dawkins was quite right when he said that "the God of the Old Testament is arguably the most unpleasant character in all fiction." But he's not human (or a corporation), so he doesn't qualify as a person.
To be fair to God, I should mention that God seemed to change his mind about the Jehu mass murders.
And the LORD said unto him, Call his name Jezreel; for yet a little while, and I will avenge the blood of Jezreel upon the house of Jehu, and will cause to cease the kingdom of the house of Israel. Hosea 1:4
The Watchtower, however, has no such reservations about Jehu. It calls Jehu "a champion of pure worship" and a model for disfellowshipping.
[T]o rid the congregation of potentially corrupting influences, Christian elders may have to act with courage similar to that of Jehu. And all members of the congregation need to be determined to avoid the company of disfellowshipped individuals. ... No doubt you can see that circumstances faced by Christians today require that they manifest certain qualities possessed by Jehu. Watchtower, Nov 15, 2011