drowsy charm
You should add their blood demon art and make them boss battles.
So for Nakimes bda you could give the player a biwa and have the player be able to crush people with doors, another attack being like a row or a group of doors that they have to speed through, teleport someone up high and take fall damage, teleport someone a few feet away or like spawn a door behind them where she/the player attacks by hitting them with the biwa, and then maybe be able to spawn a bunch of eyes that can swarm someone like a group of bees, and then for the player you could have a special ability where the player can spawn an eye that they can pilot and switch between multiple eyes or switch between piloting the player and the eye, oh you could also have the bda summon a wall to block an attack, or make a sound wave to knock back opponents (for a boss battleit would just be giving her the moves, and able to control the infinity castle like switch the rooms or flip them, ect)
For Kyogai you could have his fight within his mansion, and like once you enter you can't get out until you either beat him or die, and you can add those two demons that were in his mansion with him, and the rooms could constantly change with the drum sound and when you actually get to fight him he flips the room from left, right, forwards, backwards multiple times, he sends those claw attacks at the player, he could like send out sound waves with his drums, and when he gets low health you can have him (if it's not like the manga/anime where that one guy has the drum that switches the rooms) switch the room so you have to quickly find him again before he heals back up. Now for giving his bda to the player you could have the player get the drums on their body and be able to launch out those scratch attacks, sound waves, maybe lift up the land under the target, you could also make it so the user can play the drums all at once and cause a whole bunch of sound waves or all the moves to go off at once.
proud sierra
dense egret
quasi laurel
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