The Bishops of DEMA consist of nine oppressive rulers, each representing different aspects of despair and mental struggles. They maintain control through Vialism, a religion that promotes self-sacrifice as the way to achieve peace, which ensnares the citizens of DEMA in a cycle of hopelessness.
Nico, also known as Blurryface, is their leader, personifying fear and self-doubt, and he actively works against Clancy’s efforts to escape Dema. The Bishops' inability to perceive the color yellow serves as a symbol of rebellion for the Banditos, emphasizing the ongoing struggle for hope and individuality.
Clancy is a citizen of Dema who is unhappy and wants to escape from Dema and the bishops. He has heard rumours of the banditos who have escaped from the city to Trench, a wilderness outside of Dema. He attempts many times to escape from Dema but Nico keeps finding him and pulling him back him.
Clancy
The banditos are a group of rebels who have escaped Dema, gaining freedom from Nico and the Niners. They are led by Josh Dun, the torchbearer. The banditos wear yellow to represent rebellion and hope to the citizens of Dema.
Josh Dun, the torchbearer
Josh Dun and Clancy
Source: Pinterest
This story is a summary of the lore, created by the band duo, twenty-one pilots.
Here's a video with a lot of details on the lore:
Faith is to be awake. 💜 Peace ✌🏼