VardiBobiz

Good morning, I started creating a one shot and it's my first time as a master. The problem is that I wanted to create my own world with different creatures than the world of d & d. In fact I wanted to create as the final battle of the demons called Gabibbo and they have a different hierarchy in a creative way: White, Green, Black, and Red. For the white I put the same characteristics of an imp and for the green one I put Hezrou. For the other types I wanted to put something magical that was related to the spells of the warlock such as elderrich blast etc. etc. Would you help me create a biuld for the other creatures? Along with this how many creatures would it be better to put ?. (attached the photo of the red Gabibbo)