Like one-off characters you never write a lot for? Yes! I make tons of them for conceptual art. I think most artists do this. It's relaxing and fun. 
This is one of the newest ones I made! I'm calling her Skybright and she's a visual depiction of how it feels to be in love.
Angel Halo who is a depiction of the vibes I get when listening to vaporwave. (I actually made her for my vaporwave archive cover lol!)
And Spacemist who is a visual depiction of a dream I had in high school. Her glowing rings sent me into a dimension of grey mist that was in space. The dream never clarified but I think I was inside a nebulae!
And yes, I do give them cheesy names because I like it and my brain is partially stuck in my 00s art mode. 