OK so here's a really tried and true method to asking out ANYONE with colored hair beyond the "natural" colors:
- Even if you're not sure, you gotta appear confident
- Ask her about her likes and dislikes
- Then, if she responds well, then you can ask more questions / attempt to relate
- Have some non-douchey stories in the event that she wants to know about you
- Eventually you might have to be able to explain what it is you do for fun, don't talk about your ladybug (from one ladybugger to another)
- Right when things start to feel good, start to act a little aloof, it shows you're not desperate
- As the party starts winding down, express how much you enjoyed the conversation
- Start to make your way to leave, but not before getting her digits / socials / etc.
- Save the chit chat about sexy times for later on until you get the vibe she's interested
It's a surefire way of succeeded at a party. It's worked for me plenty of times, and it's how I got my gamer gf too.
And if all else fails, take the first letter of each line and just do that instead.