2...

Someone who borrows a skill from a random team mate.

Dark mage that puts a curse/poison on the enemies after she dies (does Queen B type damage at the start of the heroes turn for all their heroes)

A tank that becomes the target for all single target hitters.

...
Not quite the same as the idea of a hero that redirects attacks, but there could be a hero that spends his morale to 'clash his sword' against the enemy attack to act sort of as a block and counter that works against other skills. He would probably make a physical attack the next turn though.