No one level as wizard to get casting level benefits? Also Lolth-touched means your CE automatically and no longer 'defender' of the half-breeds and such (so no Batman). But for a stretch I could imagine Eilistrae has similar exact template but so instead +6 to Str and Con you get +6 to Dex and Cha.
Oooh damn that's mighty tempting. The only down-side would be that he'd be an actually good-guy in a world of evil... so he'd really be Batman. Yeah, I can see Elim ending up horribly dead fast. If I took that my hope would be that Eilstrae would be ok with the occasional act of overt evil, to maintain cover. Then again, I guess wanton killing isn't out of the question if the people you are killing are evil.
As for the lack of Wizard, it just didn't feel quite like Elim. Exotic Weapon Master was kind of a placeholder, and the Level Adjustment of one for "Eilistrae-touched" fills the gap quite nicely.
Does Batman need a partner? >.>
Well he technically does have a sidekick already, but allies are a good thing. Especially if you don't mind associating with a Drow who has set himself up to flaunt the fact he is different in mindset than most.
Aaaaand, just to clarify on the subject of Cohorts. With absolutely no level adjustments made (say, if they were human), they'd be level 12, right? That'd be the ECL of our characters -2. Pardon my brain being squishy, I just woke up from a two hour nap that turned into a six hour one.
EDIT: I'm continuing the wacky Cohort trend... with a Doppleganger.