As the title implies it would pretty dope to make it so that you can change your armament and imbuing haki color, maybe adding a config option for it just like the conqueror's Haki color logic, or maybe making it so that it's the same color as conqueror's Haki. This way everyone could have their own different Haki color to add more variety. a cool way this could be used is making it so that NPCs with Haki get random colors like players do. Now I'm no coding expert so I don't know if this would even be possible or if it's even canon to one piece, but it would be a really neat addition to buso and definitely make the Haki stand out a bit more.
https://static.wikia.nocookie.net/onepiece/images/d/d2/Katakuri_vs._Luffy_Elephant_Gun_%281%29.png/revision/latest?cb=20200327012733&path-prefix=vi
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTYNvOtgEaMaIuXDQ2ui0HX8H6r-OgihNdeVg&usqp=CAU
https://static1.srcdn.com/wordpress/wp-content/uploads/2021/10/Zoro-Uses-Three-Sword-Style-Cropped.jpg