Sosuke aizen

aizen is one of the main characters in bleach darkness

abilities and zanpacuto
flash step expert

aizen has proven that he is great at using flash step, he uses it to strike his opponents all at once or to escape a deadly attack. he also fuses flash step with kyoka suigetsu's ability to trick people by letting them believe that they have stuck him but really he is behind them.

hakudo master

aizen is a master with combat he has shown that he can cause massive destruction without his zanpacuto, but not much is known about his fighting styles or skills with hand combat.

king of kido

aizen is capable of casting increadably powerful kido tecniques without the incantation, he has shown to be able to use hado 90 kurohitsugi without the incantation and is still fully powered.

impossible spiritual pressure

during his time as a captain, aizen had amazing spiritual pressure, some of the highest in the soul society. while fused with the hogyoku, his spiritual pressure was immesurable, and the further he progressed with the hogyoku, the more devastating his spiritual pressure got, but after a while, his spiritual pressure was so powerful that no one could feel it, but if a weak spirit or human approched him, they would turn to dust.

spoiler alert!!!

when he fused himself with the ultimate hollow mask, his spiritual pressure is equal to that of when he was in his awakened stage og the hogyoku transformation, but when hollowfied, his spiritual pressure is equal to his pressure when he was in his final form of the hogyoku transformation but you can feel it instead of just being there but not knowing or being able to feel it.