Character
shields (also known as plot armor or plot
shield) are plot devices in films and television shows that prevent important characters from dying or being seriously injured at dramatically inconvenient moments. It often denotes a situation in which it strains
credibility to believe that the character would survive.
"The art is nice, but the concept is obviously pretty stupid. Hell, just the fact that they're using the most broken character with plot armor as thick as fangirls' raging hardons for him, from Naruto, against someone who was shown to only be a mediocre bender at the beginning of the series (the form of
Zuko used here) should tell you something."
--Anonymous, from 4chan's /co/ board, describing a Deviantart comic depicting
Naruto's Sasuke fighting
Avatar's Zuko.