So, I take it that you've watched all of the El Hazard anime? What is there not to understand?
Do the first two episodes of EH2 count?
But true, kind of a cyborg rebuilding of himself... hell, if he DID work with demon gods, and assuming they're part flesh, then he's got to know some of the tricks of the trade, right?
Yeah... I explained that by saying Arjah was a somewhat accident-prone scientist. Working with Demon Gods has got to be a bit dangerous. But since he was so good at robotics, presumably he rebuilt himself. As for the ears... I have no explanation for them, nor for the fact that he looks like he should be in Battle Athletes...