plot armor

plot armor is when a scriptwriter/author/anyone composing a story is clearly keeping a certain character/idea alive despite many situations where said thing would've perished given normal circumstances and logic. Normally it's because it's a main character and/or important further in the story and/or if said character is the author's favorite.

Alternatively, the term is often used in real life to refer to a person/thing that miraculously survived a situation that would otherwise prove harmful/fatal

I was reading this book and the main character has got to have plot armor... He was in a fight against 6 guys each twice his size and he somehow won!

'Guys, I just fell down 3 flights of stairs and I'm completely fine!'
'how'd you manage that?!'
'I must have plot armor...'