Hey thanks a lot!
The question came a few times. but there is a problem with characters in general. since they need to have all necessary animations: every game need different stuff. and then some devs need different enemies. it‘s never an excact fit. so doing all the chars and animations will end up in an quite expensive set. just for like 4-6 characters. that‘s the reason why you don‘t see so many char sets. I think - they are also more time consuming than tilesets; so the price would be higher.
Maybe I will do some. But I won‘t promise it for now. I think the need for it is there. but to fit a style for everyone is impossible. that‘s at least my experience.