There are tons of RPG's out there that has this concept especially in online mobile games. Hero collection rpg, personally, is a wonderful idea if done correctly. Some of you may be familiar with King's Raid which has the same concept. The game lets you choose from wide variety of heroes with limited skills (4 skills but is upgradable. Upgrades doesn't usually just increase damage. It does a lot more than that.) and are different from each other. You get to collect them and build them differently. Some of the heroes are even flexible enough to like build them to be either a tank, a dps or a cc unit. While each heroes differ from each other, the game provides a lot of diversity when it comes to strategy making. And again, personally, I dig this! These are only the few aspects that I like the most about it. My fascination over this made me think, what if the same concept is to be made using rpg maker while it being an offline hero collecting rpg? Since one of the fun parts about this kind of game is going up against online opponent, it's going to be a lot different and not as fun. But with proper game contents like a tower with rising dificulty each floors, it's going to make sense challenging players to invest time and build heroes. So what do you guys think about this idea?