Bertha

Bertha is a character that only appears once in Fallout New Vegas Survival Mode in Part 37 Et Tumor Brute. She exists for the pure reason of showing the rewards you gain from gambling at all the casinos on The Strip.

Personality
Not much is known about Bertha except for the fact that she showed up on The Strip and retired within a few days of straight gambling.

Trivia

 * Bertha is the only character whose face is never shown