What would you add to Heroes? (creative ideas only!)

Again, not entirely on topic. I would really like to add 8-10 heroes with various new abilities to each castle. For example, I'm playing a large map, there are 8 castles of one type, and all the heroes are bought on the first day, and I have an undead army with a hero, let's say, an elf with a unicorn specialty. And who needs that? To get unicorns for him!? Instead, they could create a hero with a gold mining specialty (500 per day) plus a percentage depending on the level. It would also be useful to have heroes that bring in one (or even more) rare resources per day, depending again on the level, because even ore or wood is scarce. And where did all the heroes with a specialty in a particular spell go? That was also great. And finally, heroes like Gelu from the third game, who creates his own unique type of troops.