I think many of us artists probably have some characters and stories we made up back in grade school, and maybe even developed further through Highschool until we eventually just moved on with life.
Jobs, wife, kids, reality, all push such things aside unless you make it big with your ideas.
I ended up never drawing at all anymore at some point not long after revisiting my old main story and characters I made up in 6th grade again in my mid 20s and writing a book about it. The book sold enough to make me not feel worthless, but of course not enough to go all in and keep at it when the complexities of life were telling me it was time to leave that stuff behind.
In 2007 I started playing with sculpting because I had become very interested in the idea of improving my own action figures. I resculpted over a G.I. Joe figure to make a figure of the main character in my old story, a cyborg armadillo called Vortex. It was pretty terrible.
Years later I have been doing custom figures since then and I felt it was a good time to get some practice in and see how much I've improved since back when I made that first Vortex figure. This time I wanted him to have retractable wing/boosters in his shell, wanted him to be able to roll into his cannon ball mode, and wanted the shoulder armor to be able to slope down against his shoulders for flight mode. Well I failed at all of that still because it would have all made parts too fragile, so instead I went for a Revoltech approach with interchangeable accessories.
Here is some of my art with the character from as far back as 1992, and the WIP of making a new Vortex figure.