Dissolves inorganic matter you say?

I'd like for Raiden to run into those. Since his arrival his inorganic body has been an asset to him, it would be interesting to explore it just messing him up.

In terms of degree of injury-I don't want him killed or permanently put down but that still leaves some room for flexibility. If too much of his body is damaged to maintain life support his brain can be removed and put aside by a skilled doctor while a cyberneticist fixes his frame. It can't survive indefinitely but it is laced with nanomachines that will let it survive a little while under the proper conditions. If the data chip in his left arm is saved people will be able to see his schematics, too, and work from that.

That's the maximum amount of damage I'm up for! Forced removal of his brain. This all requires someone with a strong understanding of cybernetics to piece him together, though (or someone with magic that can mend objects, typical healing will not work).

He won't get infected, because there is not enough of him that is organic to get infected. The only human parts of him are his upper skull and spine.