Sha'tra is not currently available as a hero in KRB, but this would be a good way to introduce him while also adding new abilities to the common towers to make them more viable:
• Despite the fact that the barbarians are the meta anti-air barracks, one way to make them more fun would be through a new arena and the introduction of the hero Sha'tra and a function for the towers.
• My idea would be to add skins to the Barbarians so they look like Sha'tra. I understand that Sha'tra is a homage to Predator, so it would make sense that he's not the only known space hunter.
• This would cause any tower with a hero-themed skin to gain a passive ability and a fourth ability. (By passive ability I mean the percentage increase or decrease that rare, epic, and legendary heroes and towers have on their own units, enemies, or spells).
•At the moment I can only think of it for Barbarians, but it could be applied to other heroes from different IH games, Iron Marines, Junk World, and all the KR games.
It seems like a good way to add new heroes while also improving existing towers or adding new ones, thus balancing the current meta a bit.