The Fastest & Easiest Way to Unlock Full Body Haki in Blox Fruits

Getting Aura

Go to the Ability Teacher. This is an NPC in the cave at Frozen Village and near the Magma Village quest-giver in the First Sea.

Buy Aura for $25,000. Since this ability is pretty cheap, you can buy it even if you're newer in the game. Level it to make Aura a stronger ability.

Activate Aura. To activate the ability, press J on your keyboard, down on the gamepad of a controller, or the Aura button on mobile.

Leveling Aura Quickly

Find strong NPCs that won't kill you easily. For those players with lots of health, you can easily grind Aura stages by having Aura activated, using low gear, and letting enemies hit you. You're getting experience (exp) by letting the NPC hit you; and by not using mastered weapons (like a plain cutlass or dual katanas), you're not doing a lot of damage either. You're earning Aura exp every time the NPC hits you, and every time you hit them.

Use a sword, gun, melee weapon, or fighting style. If you attack using a Blox Fruit move, you won't get any experience from that fight. Make sure Aura is activated and go damage enemies. This is the better solution if you're a beginning player without lots of health or armor.

Managing Haki

Go to the Aura Editor. Find this NPC in several locations: First Sea: inside the house with the green roof behind the mansion. Second Sea: near the big castle of Don Swan's Mansion next to the "Set Home Point" NPC in the Kingdom of Rose. Third Sea: inside the main building at Castle on the Sea. Once you've leveled up your Aura to Stage 5, or full body Haki, come to this NPC to edit which stage is active. For example, you can turn off the full body Haki appearance if you don't like being all one color. Any changes you make will only affect how your character looks, not the buffs of the stage that you have unlocked.

Find the Color Specialist. You can change what color the Aura uses from this NPC. Note that many colors require you to spend Robux to unlock. This NPC can be found in a few different locations: next to the Ability Teacher in both locations in the First Sea, the Cafe in the Second Sea, and on the left side of the mansion in the Third Sea.