Power
When you get right down to it, a video game designer career resembles a puppeteer's job. Think about it: Both of you are creating a storyline, fleshing out characters, and hopefully coming up with happy endings where the good guys win. Fortunately for you, though, video designers don't have to crawl around behind a curtain, trying to make a heap of cloth and wood entertain whining five-year-olds.
However, that doesn't change the fact that you wield immense amounts of power. You can decide on the message you want to communicate, and choose the impression you want to leave the player. Your game's concept, character design, and outcome will all somehow influence the gamers who play it. Just like a superhero, you can use your power for good...or evil.