Sousuke Aizen's current power, explained

Important takeaways

• Shunsui makes a deal with Aizen to aid the Gotei 13 in the battle with Yhwach for much needed help.
• Aizen, post-Hogyouku fusion, is the most powerful Shinigami besides Ichigo, with transcendent abilities.
• Aizen's overwhelming power, mastery of Kidou, and immortality make him invincible and indestructible.

In the latest episode of Bleach: Thousand-Year Blood Warthe newly appointed captain commander of Gotei 13, Shunsui Kyoraku, enters the underground prison beneath the barracks of Squad 1, Muken. There, while his best friend Captain Ukitake makes a deal with a God, Mimigahi, to save Soul Society, Shunsui makes a deal with the devil, Sousuke Aizen. Kyoraku talks to Aizen briefly before freeing him from his seal to ask him to help the Gotei 13 in their battle with Yhwach. Shunsui knows that there is no one as powerful as Aizen besides Ichigo, and they need all the help they can get.

It has been two years since Aizen was sealed after his epic battle against Dangai Ichigo at the hands of Kisuke Urahara. And yet, he's still a being on a completely different level than anyone else on the battlefield besides Ichigo and Yhwach. While Aizen has always been a level above the normal Shinigami, his fusion with the Hogyouku gave him transcendent power beyond anyone else in the world Whiten.

Sousuke Aizen before and after Hogyouku

An anomaly, a being beyond all others

When Sousuke Aizen was born, the soul balance was disturbed. Aizen is, in every sense of the word, an anomaly. He shouldn't exist. Even at birth, he was a being far beyond all other Shinigami. However, he knew how to hide this, and he enrolled in the Shinigami Academy and joined the Gotei 13, where he served as the vice captain of Squad 5 under Shinji Hirako. After his Hollowfication experiment that ruined the lives of the Shinigami who would become Vizored, Aizen became the captain of Squad 5, and later Momo Hinamori was his vice-captain. Using his Zanpakutou, Kyouka Suigetsu, he faked his death and betrayed the Gotei 13, killing every single member of the Central 46. He regained his Hogyouku and escaped to Hueco Mundo with Captains Gin Ichimaru and Kaname Tosen.

From the very beginning, no one has stood in the sky. Not you, not me or even gods. However, the unbearable vacuum has come to an end. From now on… I will stand in the sky.

During his battle with the Gotei 13 in the Fake Karakura Town arc, Aizen easily defeated every member of the force by himself, except for former Captain-Commander Yamamoto. All this without using complex Kidou techniques, which he is an expert at, or even his Bankai if he even has one. The only enemy Aizen saw as close to him in terms of power was Yamamoto, and he created an experimental Arrancar named Wunderweiss Margera to deal with him.

He then begins to evolve into a transcendent being, merging with Hogyouku. He fights Urahara, Isshin Kurosaki, and Yoruichi Shihouin with ease, all while transforming. After he reaches a new stage of evolution, his power is so overwhelming that it completely erases all humans who come close to him. After being betrayed by Gin Ichimaru, he evolves again, and when he fights a newly evolved Ichigo, he reaches a final, monstrous transformation. He is hit by Ichigo's Final Getsuga Tenshou: Mugetsu. And still he survives. He is sealed away by Urahara, and the new Central 46 sentences him to 18,800 years of imprisonment in Muken.

There, Aizen remained fused with Hogyouku, quietly refining his powers and discarding the physical form of his Zanpakutou, Kyouka Suigetsu. When Yhwach went to meet him during the first Quincy invasion, he was able to use the Zanpakutou's powers simply by letting Yhwach look at him. Aizen has become one with his Zanpakutou and Hogyouku.

Aizen's current power

Invincible and overwhelming

Thanks to his fusion with Hogyouku and his transcendent evolution, Sousuke Aizen is the most powerful Shinigami to ever exist apart from Ichigo Kurosaki, a completely different case. Aizen can manifest his powers with ease, without even having to release his Shikai. His mastery of Kidou has also increased. He can cast extremely powerful Kidou spells without a spell. Like Hadou 99: Kurohitsugi (Black Box) and Hadou 99: Goryuutenmetsu (Five Swirling Dragons of Destruction), one of the most powerful techniques in Bleach.

In addition to his overwhelming power, he is actually immortal and indestructible. He can take any damage and survive. Aizen would need to be hit by a divine power to take significant damage or even be close to death. Thanks to the Hogyouku, Aizen's already abnormal power has tripled. As the Muken guard approached Aizen to restrain him, his hands disintegrated as soon as he got close. Aizen's spiritual pressure is so dense and powerful that anyone who comes close to him will instantly die. The seals don't erase his spirit print, they just keep it close to him.

I have to say… You really are an entertaining man. Would I like to breathe fresh air, you ask? Would it be the fresh air of a soul company being summarily crushed by Yhwach?

Shunsui also only picked up three seals on Aizen: mouth, left eye, and ankles. This means that most of Aizen's body is still sealed. This is only part of his full power. Yhwach previously revealed that Aizen is one of the special war threats. This is due to Aizen's almost infinite power and spiritual pressure. He is invincible, fused with Hogyouku, fused with his Zanpakutou and a refined version of his transcendent evolution.

• 

  Bleach: Thousand-Year Blood War

• 

  Based on Tite Kubo's Battle Shonen manga, Bleach revolves around Ichigo, a high school student who is drawn into the world of the Soul Reapers. The original anime ended in 2012, but it was revived in 2022.