When you look at a units stats, it has an icon in the upper right for its race (mouse over it to get a little info about that race). Droids are made by Dwarves, and are considered part of the Dwarf race.
Ghosts are rather finicky. I would suggest either keeping them a little under full size, or being very aggressive with them. When they are out of control, cast 'heal' on them to do small bits of damage (or big bits!) to bring them back under your control. Keep a stack in reserve for extra ghosts.
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