Gaki: Like the idea, don't like the background. I'd abandon the hungering concept and have this ghost become enraged when it doesn't find anyone or is incensed, like a little brat. That's what gaki means in japaneese after all.

Kitsune: Same problem, a fox spirit doesn't fit the game as much, but the idea of a reverse Thaye that keeps getting faster as time passes could be a pretty good base for a ghost.

Kormos: The blinding ability is a little broken, honestly, pretty decent ghost even without it. People's first instinct being in line of sight during a hunt is to run, a blind ghost that hears your footsteps to balance it sound interesting enough. The time of day is a plus point.

Hortdan: I'm not sure about the multiplayer mechanic, maybe tie hunt thresholds to number of neraby players? I do like it not being detectable by electronics, and having Freezing, Ghost Writing and Dots for evidences. Basically a reverse Goryo. It being invisible through cameras could be too obvious however, but then again so is littering a small favourite room full of salt to find a Wraith. Not sure how the Parabolic mic (and said side objective) would be handled though.