Board Thread:General Discussion/@comment-31283382-20150404011045/@comment-24317446-20150624074943

MilanVukas wrote: It is possible that Aizen can be killed: even a nigh-omnipotent creature such as he is subject to certain laws of logic. Also, I came to believe that he is not truly immortal, but possesses a kind of elvish immortality (unaffected by age or disease, but still vulnerable to lethal blows) accompanied by perfect regeneration. Something like Madara after he was revived by Rinne Tensei. Despite taking a definite kill hit from Guy, he managed to stay alive until the obliterated portion of his body was rebuilt, thus surviving. Something similar happened to Aizen after he tooh a point blank Mugetsu that nearly bisected him vertically, and yet he survived and regenerated. However, should he have his head blasted into nothingness, even he would die. If his body took enough obliterating damage there would be nowhere to regenerate from, resulting in his death. However, this is directly disproved in the same instance. When reviewing Ichigo's Mugetsu, you notice that the sheer power of the blow atomizes Aizen completely, yet he still falls out of the sky and crashes to the ground. This leads me to believe that Aizen has the capability to rebuild himself from the atomic level, resulting in a complete immortality not currently held by anyone in the Bleach universe.

Aizen atomized: http://media.giphy.com/media/fCSbaZ0OdbeRW/giphy.gif