Tarrasque Mentality

The idea that a fictional character is absolutely indominable and can accomplish anything, usually the result of horrible writing or 9 year old writing.

Its namesake comes from indestructible Tarrasque of dungeons and dragons fame, a monster that is famously known for its overpowered nature and association with bad storytelling.

Jimmy: Seriously X character is so overpowered!
Bob: The author probably has tarrasque mentality