https://www.gamespot.com/articles/free-monster-hunter-world-item-that-lets-you-edit-/1100-6457470/

If you're unhappy with the way your character looks in Monster Hunter World but have sunk too many hours into the game to start from scratch, you now have a chance to give your hunter a makeover. Ahead of next week's big Monster Hunter World update, Capcom has distributed a Character Edit Voucher, giving all PS4 and Xbox One players one free pass at tweaking their avatar.

The Character Edit Voucher is now available from the PlayStation Store and Xbox Store. With it, you can modify your character's gender and physical appearance. However, you won't be able to change your hunter's name, nor will you be able to edit your Palico's appearance or name.