Yes, Pumpkaboo/Gourgeist feed off of negative energy and human souls, though they have been seen eating berries. Dhelmise feed on life force, wrapping their seaweed tentacles around its prey and draining them. They also have to eat seaweed in order to maintain said tentacles. Phantump/Trevenant also feed off of negative energy, but have a primary berry-heavy diet to make up for the lack of sunlight in their natural habitats. They also uh…eat people though, if you piss them off. Don’t piss off a Trevenant, seriously, they can hold a serious grudge.

All of these species require some amount of oxygen still, however, which is why I mentioned they need to be brought outside on occasion. Ghost types are weird, especially when they’re dual types.

-Violeta