To get full body Haki in Blox Fruits, start by unlocking Haki. Go to Middle Island and find the house with an aura editor. This is where you can enhance your Haki abilities.
Next, head to Snow Island and locate the hidden cave. Inside, meet the color specialist and the ability teacher. Purchase the AA ability for 25,000. This boosts your physical attacks.
Now, it’s time to grind and level up. Find a spot with NPCs that have high HP. Use a sword and an auto-clicker to quickly gain Haki experience points. This method works even when you’re away from your keyboard.
As you level up, use the aura editor to equip your upgraded Haki. You can find an aura editor on every island.
For those with a Logia fruit, use it to avoid damage from enemies. Hit them with a sword to gain experience. Another method is to gather multiple NPCs and hit them rapidly to gain experience quickly. Patience is key, as leveling up Haki takes time.