He is brought in as the main antagonist of the Soul Society arc (the first major plotline in Bleach and one of the most popular). Although Aizen is inevitably uncovered as the real puppet master behind Rukia's execution, Byakuya's insistence on protocol nearly gets his beloved sister killed...
5. Sousuke Aizen from Bleach crunchyroll Episodes: 366 Aired: October 2004 – March 2012 As a mild-mannered Soul Society captain with glasses and short brown hair, Aizen has “background character” written all over him. He’s calm, polite, gives lectures on calligraphy... how could this ...