So you've managed to suppress your baser natural instincts and get through dinner without vaporizing the condescending waiter with the fake French accent. Ironically, a fake French accent is the most annoying thing ever next to the actual French and vaporizing one would have been looked upon not unkindly by society as a whole. Still, good call on the restraint.
You're feeling comfortable as the evening progresses and maybe you think you should share a little more of your true self now. DON'T. DO. THIS. You're a Super-Villain. It's still way too soon. You're trying to get her to see your tiny little spark of humanity before you encased it in a tar black leather jacket of evil. You can't just spring "Oh, by the way, I'm a Super-Villain" on a woman before dessert arrives on the first date.
Since your default position is usually to lie and cheat, this shouldn't be that hard. But I realize you're fighting your own nature by repressing your primary programming and holding back the monologue that is forever just on the tip of your tongue. It is vitally important not to monologue on the first date. Nothing will kill a mood faster than describing your latest electrified, poisonous, piranha-filled, Grizzly bear enhanced Superhero deathtrap to a woman you just met.
Even if you met through "SuperVillainMingle.com", that's a no-no the first time out. For our purposes, we suppose you had some sort of awkward meet-cute and she has no clue what your real job is. Let's keep it that way for now. We're in it for the long haul here. If there is a benefit your profession can provide at this time, it's that you're used to creating overly complex solutions to problems.
Since women tend to be overly complex, your methodology can actually be helpful. You just need to tune it from "How do I melt the North Pole, flood western Europe and corner the local scuba gear market" to "How do I get her to like me without revealing that I'm mostly evil". So, sit back, relax and make witty small talk while fake-French-accent guy serves the Croquembouche.
Slow and steady wins the race. Nice touch, leaving a slow-acting neurotoxin on fake-French-accent guy's tip. I saw what you did there.