Sosuke Aizen from Bleach stands out as one of the greatest villains of all time in the world of anime, probably because of his unrevealed Bankai. Despite being so powerful, Aizens’s Bankai remained a secret. His Bankai is one of the mysteries in Bleach, resulting in fans often coming up with new theories regarding his Bankai and its probability. Some of them think that this is the reason that Aizen became the greatest villain of all time.
By keeping his powers secret, Aizen makes sure that no one can learn what his true capabilities are. He is never shown disclosing Bankai, this makes his opponents always wonder how far he can go. This is one of the primary reasons which makes him a nightmare to his foes.
The Power of Kyōka Suigetsu and his God complex
Aizen’s Zanpakutō, Kyōka Suigetsu is already an intimidating weapon. Aizen is capable of drawing hypnosis on his opponents while manipulating the five senses of his opponents. This allows him to create perfect illusions, the immense capabilities of Kyōka Suigetsu already add to his establishes him as a formidable foe. Considering the power of Kyōka Suigetsu, his Bankai has great potential. Also, there can be another explanation that his Zanpakutō does not allow him to use his Bankai.
This fan theory simply states that Aizen did not need to use his Bankai as it was one of his strategic choices. Maintaining his Bankai as a secret he made sure that his Shikai effect remains unaffected. Probably his Bankai was so strong that it could bend reality.
With his Bankai unrevealed, Aizen maybe could travel back to the past, this would also reveal the reasons behind his God complex and his hate for Urahara. All of these point out one thing and that is how he never reveals his Bankai makes him the most terrifying villain. This shows how his Bankai has unlimited potential, not only does this work as the justification for him being the greatest villain but also it adds up to his overall appearance as a villain in Bleach.
Symbolic power of Aizen’s legacy
The symbolic power Aizen possesses lies under his unrevealed Bankai. In many ways, mysteries revolving around his Bankai allow him to draw his invincible aura. To put this, it can be stated that by not showing his Bankai he creates an atmosphere of psychological pressure on his foes, which adds up to his title of greatest villain of all time.
Aizen does not need a Bankai, according to a comment on Reddit. It clearly shows how this is the reason that Aizen has been able to become the greatest villain of all time. On the other hand, if he had a Bankai known to all maybe that would make him predictable and not that much intimidating as a villain.
The fact that Tite Kubo did not reveal his Bankai yet, allows Aizen to be symbolic. The legacy he carries simply makes him the most terrifying of all the time as a villain.
Bleach is available to watch on Crunchyroll.