what if Kisuke Urahara died during Ichigo's final battle with Aizen but during his last moments the hogyoku free from Aizen's controle granted his one final wish that his zanpakuto benihime to live with the weakened space from Ichigo and Aizen's battle and its vast power it sent it to a completely separate reality were it bonded to a young Midoriya where Benihime helps him cultivate his potential and become the greatest hero

requirements

1. harem (do to izuku's kind nature Benihime picking up some of Urahara's acentric and perverted nature etc.)

2. Benihime has the powers and abilities from the anime and manga ( look it up probably my favorite zanpakuto) and some new ones do to izuku being a different soul than Kisuke ( like how Isshin and Ichigo have similar blades do to relation but with some differences) and teaches Izuku advanced subjects and shinigami techniques from it's time with Urahara

3. Izuku gains self-confidents and develops crafty and resourceful personality traits and skills

optional

1. Izuku still gains one for all ( it would be interesting to see how it would react to the wills of the past users and Benihime and her ability to repair and alter her users body)

2. Benihime's form like her sealed form( like as Urahara's cain), standard, shika, bankai, and manifested spirit forms you can decide it just has to be some difference for Izuku than when Urahara had it and i would prefer her sealed form be something Izuku can carry around without catching suspicion but if you can make something more eye-catching then go ahead