New Hero units

I was thinking about introducing new hero units for players. They can be summoned only once during each fight. High hp and high dps. But they wont be killed during the battle, they would get injured and would require some time to get healed depending upon the amount of hp they have lost. And they could also have special abilities which are unlocked after reaching certain lvl. What do u think guys ? I haven’t really thought about the names. Maybe u guys can suggest a name and more ideas which would improve these heroes.

Perhaps have the girl lead the troops? I don’t know, I think the game is fairly well-balanced as it is, and giving any additional powers to the attacker, without any additions to defense, would just kinda mess that up.

Create a mechanism to share same account across different platforms.