Yeah, but anyone with a shield here's what I try to do if I have the combo, assuming I don't have the guy for the shield (I'm looking at you light blue.)
First I cycle through to a Poison one if available. Poison the ghosts. Freeze/sleep them and then whittle them away with magic if possible. That way my lvl 1's will always do at least 1 damage on them.
A promotion Luigi Mansion 2 Version would be awesome. Where they have captured your Mii in a Mansion with that style of ghost.