For school art class we had to design a bunch of different faces, and then pick one to sculpt from clay. Jokingly I decided to draw the most over-the-top edgy design I could come up with (and then dubbed it "Joshua", because I thought it would be funny to give an edgy demon an anticlimacticly generic name). But it turned out to be the most interesting design on my sheet of brainstorm sketches, so Josh was the one I picked to make.
So as we worked on that art project over the course of several weeks, bringing Josh to "life" - as well as talking about him with my friend who sat next to me, who was making her own character (We would come up with senarios about them together. And shipped them.) - made me grow attached enough to develop Josh into an actual character and not a joke.
On the same page that the original Josh was drawn on, my friend drew a simple little doodle (little more than a stickman) of a demon, and jokingly proclaimed "this is Joshua's uncle". So when I was developing Josh and thinking about what his backstory should be, I decided that he would indeed have a demon uncle who played an important role in the story. And that's how Carver came into existence.
(Also fun fact it took me so long to actually come up with a name for Carver so for like several months he was known only as "Joshua's uncle" lol)
Of course this also required filling in the missing link, consequently leading to the creation of Josh's father and Carver's brother, Eden... and then the entire DemonHeart story and cast.
And now, all these years later, these three are some of my most developed and beloved characters. And to think, all this is the legacy of a silly design doodle I expected to be nothing more than a throwaway joke :")