Pathfinder: Wrath of the Righteous allows you to play as a godlike trickster. You must unlock the Trickster Mythic Path to do this. You can learn how to unlock this Mythic Path below.
To unlock the Trickster Mythic Path, you must travel to the Blackwing Library. This location can be found in the city of Kenabres. This library holds the biggest collections of books in the field of demonology and so is a key location.
Related: How to unlock Azata Mythic Path in Pathfinder: Wrath of the Righteous
Inside the library, you will find a group of cultists. You will need to convince them that you are their superior. In doing so, you can also convince the cultists to fight amongst themselves. This requires a lore religion check as well as a perception check. This allows you to realize that they are not crusaders but rather cultists.
Alternatively, you can opt to fight the cultists, but this will lock you out of the Trickster Mythic Path. Tricking them will unlock the Trickster Mythic Path. This is the only way to unlock the Mythic Path so it is recommended to make sure you can pass the required checks before heading to the library. Neither checks are difficult and only have a DC of 10 so you should be able to pass them easily.
For more information on Pathfinder: Wrath of the Righteous, check out How to unlock Legend Mythic Path in Pathfinder: Wrath of the Righteous and How to unlock Gold Dragon Mythic Path in Pathfinder: Wrath of the Righteous on Pro Game Guides.