There is no shortage of villains in One Piece, but very few of them have made as big of an impact on the series as Blackbeard. He started his journey as an apprentice on Whitebeard's ship. Blackbeard bided his time and eventually left the crew, and managed to earn the position of a Shichibukai.
Currently, Blackbeard is a member of the Yonko, which makes him one of the four strongest pirates in the world. So far, Blackbeard has committed various heinous acts, and he shows no remorse for his actions. With that in mind, let's take a look at the evilest deeds Blackbeard has committed in One Piece.
8 Killed Thatch
Blackbeard waited on Whitebeard's crew to get his hands on the Yami Yami no Mi. He waited for years to find the devil fruit, but ultimately Thatch managed to locate it first. Blackbeard was distraught, and there was no way that he would let Thatch ruin his goal.
Therefore, Blackbeard did what no one else dared to do on Whitebeard's ship: he murdered Thatch and broke the iron rule by killing one of his fellow crewmates. After killing Thatch, Blackbeard left the crew and formed the Blackbeard Pirates.
7 Captured Ace
Thatch's death caused a lot of grief among the Whitebeard Pirates, Ace in particular was affected by it because the culprit, Blackbeard, was a part of his Second Division. Ace was furious, and so he decided to find and capture Blackbeard. Ace's journey to find his former underling came to an end at Banaro Island.
Blackbeard offered Ace a chance to join his crew and revealed his plan about capturing Luffy. Ace was enraged by Blackbeard's audacity, and it led to a fight between the two. Sadly, Blackbeard managed to defeat Ace and used him as a bargaining chip to gain the status of a Shichibukai.
6 Killed and Stole Whitebeard's Devil Fruit
After capturing Ace, the Marines decided to execute him. Whitebeard, who was known for protecting every single member of his crew, could not let this happen. So, the Strongest Man in the World along with the rest of his crew made their way to the Marine headquarters. Sadly, they could not prevent Ace from dying.
After Ace's death, the Blackbeard Pirates arrived at Marineford. Blackbeard's presence filled Whitebeard with anger and the latter started to beat him. After withstanding a fury of attacks, Blackbeard decided to hit back, and he shot the Yonko countless times, which led to Whitebeard's death. To add insult to injury, Blackbeard also stole Whitebeard's devil fruit.
5 Murdered Absalom
Absalom was a member of the Thriller Bark Pirates, and he was one of Gekko Moria's closest associates. During the Wano Country arc, it was revealed that Absalom was killed by Blackbeard and his crew because of his devil fruit. Absalom's Suke Suke no Mi was given to Shiryu, who used it to fight against Gekko Moria.
When Moria arrived at Blackbeard's location, he was baffled to learn that Absalom was dead. Instead of allowing Moria to mourn, Blackbeard ordered him to join his crew.
4 Captured Bonney
Like Blackbeard, Jewelry Bonney is one of the members of the Worst Generation. She is the captain of the Bonney Pirates, and she possesses one of the most unique devil fruits in One Piece. After the Summit War was over, Blackbeard once again decided to make a deal with the Navy, and this time he captured Bonney and asked for Navy ships in exchange.
It is unclear why the World Government wanted Bonney, but this was another demonstration nature of Blackbeard and his ruthless nature.
3 Destroyed Marineford
After stealing Whitebeard's devil fruit, Blackbeard became the first known person with two devil fruits. With his newfound power, it is fair to say that he joined the elites in One Piece. Blackbeard decided to try out his new power, so he used the Gura Gura no Mi to create quakes that caused a significant amount of damage to the Marine HQ.
Blackbeard showed absolutely no regard for the lives of the countless Marine soldiers and pirates present on the island. He would have successfully destroyed the entire island if Shanks had not intervened.
2 Causing The Whitebeard Pirates To Disband
The Whitebeard Pirates suffered a lot of losses during the Summit War. They lost their captain, Whitebeard, and their Second Division Commander, Portgas D. Ace. The deaths of those two shook the entire crew, and they were extremely disheartened. With no other options, Marco became the new captain of the Whitebeard Pirates and tried to keep the crew together.
However, Blackbeard had other plans and he engaged the remnants of the Whitebeard Pirates in a battle. This war was known as the Payback War, and it resulted in defeat for Whitebeard Pirates, and it enabled Blackbeard to become the new Yonko.
1 Freed Criminals From Impel Down
By becoming a Shichibukai, Blackbeard gained access to a lot of facilities, including Impel Down. When Luffy and co. were trying to break out from Impel Down, Blackbeard invaded the facility. After arriving in Impel Down, Blackbeard went to Level 6, where he asked the worst criminals in history to fight to the death. This resulted in a great deal of chaos and bloodshed.
After the fighting concluded, Blackbeard freed the dangerous criminals and made them join his crew. Then with his new crewmembers, Blackbeard went to Marineford, where they wreaked further havoc.