You know you just want to be Luffy from One-Piece.

Gomu Gomu no Pistol

Starting when you choose this tradition at 3rd level, you can hurl your fists using your stretchy rubber arms.

You gain a new attack option that you can use with the Attack action. This special attack is a ranged spell attack with a range of 30 feet. You are proficient with it , and you add your Dexterity modifier to its attack and damage rolls. Its damage is radiant, and its damage die is a d4. This die changes as you gain monk levels, as shown in the Martial Arts column of the Monk table.

When you take the Attack action on your turn and use this special attack as part of it , you can spend 1 ki point to make the special attack twice as a bonus action. When you gain the Extra Attack feature, this special attack can be used for any of the attacks you make as part of the Attack action.

 

Gomu Gomu no Gatling

At 6th level, you gain the ability to bring your fists forward repeatedly in a blurry, rapid barrage of strong punches that creates the illusion of having multiple arms.

Immediately after you take the Attack action on your turn, you can spend 2 ki points to activate this ability as a bonus action. Target: 15ft cone. Dex save for half damage. Base damage 3d6 fire, spend additional ki points to add 1d6 fire per point, up to a total cost of half your monk level.

Gomu Gomu no Gigant Axe

At 11th level, you can inflate your rubber bones to expand your fist or foot to a gargantuan size, and bring it down on your enemies.

As an action, hurl your fist or foot at a point you choose within 150 feet. Each creature within a 20-foot-radius sphere must succeed on a Constitution saving throw or take 2d6 radiant damage. A creature doesn't need to make the save if the creature is behind total cover. You can increase the damage by spending ki points. Each point you spend, to a maximum of 3, increases the damage by 2d6.

Haoshoku

At 17th level. you gain the ability to use your Haki to overpower your enemies lifeforce.

When you hit a creature with an unarmed strike (including Gomu Gomu no Pistol). you can spend 3 ki points to begin overwhelming your opponent. This effect lasts for a number of days equal to your monk level. The effect is harmless unless you use your action to end them. To do so. you and the target must be on the same plane of existence. When you use this action, the creature must make a Constitution saving throw. If it fails. it is reduced to O hit points. If it succeeds, it takes 10d10 necrotic damage.

You can have only one creature under the effect of this feature at a time. You can choose to end the effect harmlessly without using an action.