The trem is definitely an Edge, not a LoPro, notice how the finetuners are placed over the extended bolts of the locking saddles.
(that wouldn't rule out actual Floyd Rose, Schaller or low-end Ibanez bridges, but all in all it seems to look like an Edge).
The
body shape seems to be a combination of RG and S factors. It has the flat elbow part of the RG body, but the cutaways seem to be rounded like the S.
This pretty much sums up the Power body shape:
http://www.ibanezrules.com/catalogs/us/1988/p_3.jpg
However, that still doesn't explain the 24 frets,
pickup combination and control arrangement.
It could be a custom model, it could have been customized later (someone may have put an RG neck onto the body, and it seems the cutaways are rounded out further aswell, perhaps to match the 24 frets?), or it's perhaps just a stock model that wasn't mentioned in the 1988 catalog (I think 1988 was the only year the Power was made?).
Or approach it from the other direction... it's an RG and someone rounded off the points on the cutaways, making it look more like a Power or S shape.