Hey, I've written up a bunch of rules for playing Dark Eldar in Dark Heresy system with emphasis on Rogue Trader, as such a character is more likely to appear there. It's not for everyone, but Dark Eldar characters can offer a decent amount to a party and visa versa.
I've finally revised them to the point where they are readable, and haven't completed some of the tables. I'm still playtesting them.
docs.google.com/document/d/1GxR4YRAcAasdI6ns2_LLboLy_UvLUnD57NnHLKg1GGI