Sup FFH.
By testing some event, I discovered that you can make visible but invinsible units (cannot be hit nor targeted but they fonction normally)
AFAIK, how to do this : Event editing only.
Warp to-be-ghost on another unit.
Erase TBG's sprite while it's on another unit.
Warp it away or not.
Start the combat ; It will appear at his turn, and be un-targetable.
Il WILL use this in CoP (it's so awesome

) but heh, I thought I could share.
needs pix for clerification of just exactly what you mean.
I think what he means is that by doing this, the selected unit becomes invisible and untargetable by other units, at least until the unit's first turn.
No, he stays Untargetable unselectable and invisible, but he's visible at his first turn.