Not sure if this comment will be seen or not by author but for the zanpakuto, how about something similar to the ability seen by the playable character in Okami. Need a bridge? You’ve got one. How about a door to leave the rule book without having to kill you’re opponent? You’ve got one. (Also would create a pretty Inescapable prison) honestly the power could provide a lot of utility for Kuromiya. Although lacking in offensive power, I suppose you could make up for this by creating fireballs or spamming swords a la Gilgamesh, could be a versatile ability.

Still waiting for it

Nice chapter. **. Keep waiting for it

Hey, nice chapter. (Still waiting)

...ha...ha...still...waiting for it

Still waiting... (but great chapter)

I’m still here, just waiting...

...still waiting

Still waiting for it...

...keep waiting for it...

This story is LEGEN-wait for it...

Hey, really loving your story so far. A possible idea I had for the MC’s zanpakuto would be something similar to Caster’s Noble Phantasm from Fate, Rulebreaker. Possible abilities would be neutralising some of the enemy’s abilities, say he could ‘break’ the rule imposed by Soi Fon’s shikai so that he wouldn’t die to its effect or being able to ignore the rules created in Shunsui Kyōraku’s shikai. I know that it could become very OP very quickly but if handled well I think it would be a great ability that would fit with his character.