>>23491300
DRC scheme comes from Zero Beyond. It's kinda obvious. Also, you guys easily forget that Belial isnt actually evil. He's greedy and jealous but he's still a hero and he never wanted Rayblood's power. Rayblood forced his way into Belial's body. (At least in the original movie. Whatever Sakamoto did with UGF is a different can of worms, borderlining character assassination) and we know Belial is good because Geed is 99.99% clone of him raised by humans, turned out fine.

Anyways his colour scheme can be broken down as:
Gold: Standard super form colour, no surprise
Red: All 3 components have Red
Blue: Zero is blue, Beyond crystal are also blue, not purple

It should be pretty obvious that most of the DRC motif is lifted straight from Zero Beyond since he's Z's master. Honestly, the 2 Belial components are just there to make Beliarok a thing lol (to sell toys. duh)