Blackbeard, like others who carry the Will of the D., has a strong belief in fate and the dreams of men, but unlike the others, is the only one who truly seems to take it to heart.
He shares several attributes with Luffy, including having a voracious appetite, carefree attitude, competitive and reckless nature, persevering even if there may be grave consequences, and huge ambitions to follow his dream of finding One Piece and become the new Pirate King. Despite that, there is also a great contrast between him and Luffy: primarily, Blackbeard fears death whereas other D. carriers embrace it if it comes, and was willing to betray his own friends for power. Just before his death, Whitebeard noted that Teach was not the one Roger had been waiting for and dismissed Teach as being incapable of continuing Roger’s legacy.
Perhaps because of his strong belief in fate, Blackbeard is highly amoral. He believes that there is no inherent “good” nor “evil” in the world, jeeringly mocking anyone who expresses such belief. He is also patient and conniving, having spent decades on Whitebeard’s ship just to get his hands on the Devil Fruit he wanted, before killing Thatch and leaving the crew. His nihilistic tendencies are in line with the power of the Yami Yami no Mi he possesses, which is said to reduce everything to “nothingness”. He showed his ruthlessness when he killed Thatch, and with his crew’s help finished off his former captain, Whitebeard.