Maybay, Hellboy 2 was awesome. 

I could see the two ideas working pretty well separately. 

If you want to mix shields and invisibility just have them be a Metahuman reminiscent of Susan Storm. A better codename might work two :P 

And the second character could be a telepathic elf-born like Nuala. Half-breed children of mystical beings are getting more and more common in the world and they straddle a line between the mortal and magic worlds.