To unlock full body Haki in Blox Fruits, you can follow different methods. One way is the AFK method. Find an NPC with at least 10,000 health, equip your weakest sword, and position yourself so the NPC can attack you but you can’t hit back. Auto-grind to gain Haki experience.
Another way is the non-AFK method. Use a Logia fruit to become immune to damage. Find a high-health enemy without Haki and hit them repeatedly to gain experience.
An alternative method is to go to Starter Island, set your spawn point, and let Bandits attack you if your health is over 1000. Use a sword, Dark Step, and sometimes Light to farm Haki.
For tips, use a fruit like Buddha to make AFK grinding easier. Farming multiple enemies at once also helps gain more experience. Avoid using fruit attacks to kill players, as they don’t contribute to Haki XP.
By following these methods and tips, you can efficiently unlock full body Haki in Blox Fruits.