Answer:
Walter White from Breaking Bad
Explanation:
I just finished watching Breaking Bad, and find that the main character, Walter White is a fascinating character. This is partly attributed by the ability of the showrunners to create a character that, although in the beginning was highly sympathetic, as the show goes on he became more and more villanous; making it a near-perfect depiction of how a normal person can be an incredibly horrible person, through the combination of circumstances and decisions that the person chooses to make.
At the beginning of the series, Walter White was a high school chemistry teacher who finds that he has been diagnosed with advanced-stage lung cancer. Wanting to make money to pay for his chemotherapy, which in the beginning he did not even want to do, he uses his advanced chemistry skills to become a methamphetamine manufacturer. Throughout the series, he murdered a sizeable number of people, manipulated countless individuals, ruined his own marriage, and yet even by the last season, he did not consider himself as a bad guy because he thinks that what he did, he did it for good reasons.
This type of thinking is almost too realistic of many white-collar criminals, or those who engage in unethical behaviors. There is merit after all, in the saying: The road to hell is paved with good intentions.