Had some good suggestions for animals species associated with ghosts, so I wanted to throw them down in rough sketches.

The basic idea is some daredevil, worker, or supernatural skeptic who explores a haunted house. The ghosts mess with them, or somehow get absorbed en mass, and are absorbed so thoroughly they swell up and turn into a big new monster gal of some sort.

So, three main ideas are:
-Sluggy, ectoplasm, slimy girl, all about the blimping out, the squish, bloating look. All their slime drips upwards, no sense of gravity.

-Snakey, long, spirity looking girl, with solid skull, maybe avian themed. Super long, just phases through all different bits of scenery.

-Canine, hell hound chimera character, maybe one head is the original, and other mouths and heads surface as the ghosts chip in, chatter and mess with them.

I couldnt figure out a good spider, horse or bird themed character. Not putting it to a vote, but just curious to see what folk think.