Ooh, did you purposely release this poll around Halloween time, Brendino? :P I've always like the ghost type. Let's see....
Shuppet/Banette: Haunted puppets make for an excellent idea for a ghost type! I didn't come to appreciate their design until late 5th generation. Shuppet is such a cutey. I like his eyes, like he's wearing eye liner. And he reminds me of the ghostkerchief from Neopets, haha. I used to consider using Banette in an RSE remake before XY came out but I was on the fence... seeing its mega evolutions amazing design makes me really want to use it now!
Litwick - Candles, lanturns lanterns, chandeliers. All very spooky objects for a haunted house, and all naturally progressing technologically. Litwick is such a cutey, and Chandelure is so elaborate just as a chandelier should be. I like how Chandelure has a stitched-like mouth. As said elsewhere, this approach for the first ever Fire/Ghost was so much more creative than just some wisp.
Phantump: It's cute! Its concept is really good too.
Gengar: I don't think I voted for Gengar on purpose for the poison poll mostly because I think of him more as a ghost than a poison. So here's my vote to represent Gengar now, even if it doesn't do anything. #1 ghost imo much spoopy