Cimorene

I've seen this in anime fandoms as well -- although given the doujinshi tradition, wherein artists feel free to render anyone and everyone as sweet-faced teenagers, maybe it's a little more explicable.

Still. Blair Sandburg is observably not so small he can practically fit into Jim's pocket, to choose a story example I still haven't forgotten after ten years. If you're changing so many things about the characters that the only resemblance to canon is the names, wouldn't you be better off just writing original fic?