Draco Malfoy

By the end of the Second Wizarding War, Draco had become disillusioned with the Death Eaters' way of life. He reluctantly participated in their activities and, by the end of the war, remained undecided. When Harry Potter was captured in his own home, Draco hesitated for a long time to hand him over to the Death Eaters.

It's implied that, as an adult, Draco regretted joining the Death Eaters and shed some of his prejudices. He developed civil, if not friendly, relationships with his old school rivals, and he apparently raised his son Scorpius to be better than he was. He later admitted to Harry that he never truly aspired to power like his father, and that his true goal was to become a Quidditch star, but he wasn't good enough, and overall, he simply wanted to be happy. He also envied Harry's friendships, as he only had Crabbe and Goyle.