They're based off Greed, Solitude, Fear, and Hatred from Block Tales Swords of Time. Btw, my RPG is named PetiliLilligant.

They were once one entity. One powerful entity of Negativity. They had a surge of Power which caused them to separate from one another. This forced them into being fragments of their former selves, kinda like Reshiram, Zekrom, and Kyurem. They are the masters of Scarcity, Depression, Paranoia, and Rage and all 4 are powerful. Scarcity is known as the Master of 1 million Wants and Needs and is found in Terror Manor's basement in World 3 where he has all the wants he could ever possibly need. Depression, known as the Empress of Heartbreak, is found by herself in the Master Bedroom of Terror Manor as she wants to be alone in her suffering and pain. Paranoia is in the backyard. He is the Progenitor of Fear, and resembles a wasp to Intimidate those who step on his path. Finally, Rage is the Diablo of Wrath, the mind's embodiment of the devil itself. As the strongest of the 4 fragments, Rage rules them by an Iron Fist. In the post game, they participate in the Stadium of 120 Battles on Battles 26, 27, 28, and 29 respectively.

Now for the inspirations for their designs. The Arrows of Fragment of Scarcity are based off Supply and Demand in economy where they go up and down and all that jazz. Scarcity is Green to match Greed's Yellow color scheme but not directly copy him. Depression is Purple to be like Solitude's blue, but not directly copy her. Her tears at the bottom of her design are basically a tail of frozen up liquid she can use as a weapon. Paranoia resembles the Bee Happy enemies from Block Tales Swords of Time. He is Red to resemble Mr. Virtual, another character commonly associated with paranoia. Finally, Rage's trident tail and black color is a nod to Inkfell from Pillar Chase 2 Precode.