There is only Doom!
Scientist, Magician , Patriach, All Around Evil Sucka!
I mean think about it Ra's was just created as a Doom for Batman (with all the mystical occult hoobie and having the resources of a small nation).Even look at the reinvention of Luthor as a businessman and not a scientist - it's all Doom.
As far as nemeses go Joker's the king - his chaotic insanity is a perfect foil to Batman's controlled insanity - but Doom is a villain for all.
