Death Note
I loved this so much you really saw light slowly change into kira and when he was locked away and his memories were taken you could really see how kira and light were different people and the notebook changed him and ruined his entire life, even though what he did is awful and literally mass murder a part of me wanted him to win in the end since he really believed it was what was best for the world and worked so hard and since the main character is traditionally the protagonist, its hard not to root for the main character but he was truly a horrible person i think solely because of that notebook, it completely took over his life and he became obsessed which led him to his death and all the obsession he was kind of holding in really just spewed out of him in the warehouse with Near and he still thought he could win for a hot minute like what the whole entire last 15 minutes of the last episode were perfection it felt like one of those moments where you realize that you actually feel bad for the villain not even to mention Ls impact just all around even after his death he was still a major factor in every descion light made as kira i think it made so much sense for L to die although i love him it was so cool to see how smart L was comparing him to Near and Mello this was overall an amazing show