Fanfic-style warning ahead.
Zoro:
Wano: blackening Enma and reopens Kaidou's wound
BB Pirates battle and World Government battle: making Wado Ichimonji into a black blade - failed - getting a powerup oriented to Observation Haki instead, which function like superior version of Chopper's Brain Point to cut to the enemies' weakness, but also increase Zoro's brain function to the extremes. It also sharpen Zoro's reflex and reaction to the utmost degree. Using it in Asura Mode as a last resort to defeat Awakened Shiryuu, Zoro create a new Demon, or rather, Godly Spirit inside of him: Takemikazuchi, Deity of War and Lightning.
Mihawk battle: losing and getting cornered, Zoro makes Wado Ichimonji into a state beyond black blade - the capability of altering Wado's materials using his special Armament (on-off type of activation) into new material harder and sharper than Seastone - the only one in this world: Emerald Sword of Life.
---
Luffy:
Wano: incorporating the fusion of Rubber + Internal Destruction Armament - surpassing even Prime Rayleigh's Internal Destruction.
BB battle - Rubber's Awakening: Losing and cornered by BB's unlimited gravity, Luffy searching the deepest part of Devil Fruit's soul and finds the way to compress and release not only his body, but also the space surrounding him. Eventually, Luffy finds a way to utilize Conqueror's Haki to conquer the clash of each ability's (Rubber Awakening and Internal Destruction Armament) imbalance.
Using Advanced Conqueror Haki to formulate a perfect combination between Devil Fruit's soul with Internal Destruction Armament, It results in Luffy's capability to create much concentrated, superior, haki-based, and more importantly reflective version of Ursus Shocks within the space of his proximity, be it by him punching the air, gripping the air, other gesture, or even by no gesture at all but just willing it to happen at his domain.
Just like WB's fist or pulling motion creates vibrations, Luffy's fist or grip can make explosions of reflective air/vacuum explosions. This results in Luffy being able to reflect the imploding gravity into expanding force from the inside-out, neutralizing the blackhole. A a dramatically superior version of Luffy's body reflecting the bullet, is Luffy reflecting the space and gravity involved. Luffy calls it, The King's Regalia.
---
The fateful battle against Imu:
Becoming one with The Will of D and One Piece.
This is Luffy's final, ultimate ability.
.Path of The King - Heaven's Dreadnought.
Luffy freely travels from one point to another, by rubberizing thus compress-crushing the very dimension he travels through, resulting in true teleportation. His teleportation path suffers the experience of limit-breaking compression, bestow ultimate devastation of any existence within it, which includes any form of matter, energy, fundamental forces, time and space, even causality itself.
