These are all so amazing. If you ever author and illustrate a comic, I'm more than willing to be your first buyer!
I think a bit on them, since a lot of these are characters that I have in mind for a story I sort of think about what sorts of situations I want to see them in that align with their traits, this includes the monstery characters, they are my OCs. If you mean the designs of the OCs themselves, I sort of take a familiar concept and just warp it until I get it someplace where I like. Like a game of telephone but with more planning.How do these concepts come to you? Do you need to think a lot about them, do they come when you're in a certain mood?