I am genuinely interested by what words carry and in your case the kind of people they are going to attract. I actually write a bit on that. If you emphasize a lot on ninja/ elite etc... I would guess you will attract a lot of immature people who have ego probably bigger than their talent.
If you look at the phrasing of Y Combinator or even Facebook ads for developers you can see that even if they add some words to be fun they are careful about their use not to send the wrong signals.
Anyhow I wish you the best for your initiative!
Maybe I live in a bubble (downtown SF), but it seems the best devs I've ever worked with on open source and consulting project tend to have a pretty weird (maybe immature) sense of humor. In most early stage startup offices here, it's not weird to see grown men (and brilliant devs) run around the office and shoot nerf guns at each other.
1999 called, it wants its startup cliches back.
About attracting bozos... maybe we will. We think that instead of trying to weed out the bozos, let everyone in and see how well they perform. If a "bozo" can ship and gain traction with their product, then they aren't bozos are they? But if the bozos flake out, that's ok too. What will be left is the "elites".
Yeah, we're joking around with marketing on our site. We figure it's better than being ultra serious. But I'm sure there's a balance that we're going to need to eventually get to.