u/Magyst, Extraterrestrial Rio is - putting it lightly - a wasted Hero slot.
Currently, her perk only allows Energy Damage to do extra damage against Shielder shields - not even the Shielders themselves.
This subreddit has been giving suggestions for how to improve her since the day she was added.
(plus, it takes less dev time to experiment with an already existing Hero than to implement a totally new one. food for thought)