Spectra Vondergeist

Spectra Vondergeist is the daughter of a ghost couple. Her real age is 16 in monster years, same as Ghoulia. Spectra can float through walls and floors. She posts the "Ghostly Gossip" blog, which often gets entirely the wrong impression from things she overhears and sees. She's prone to jumping to conclusions. In her diary it's hinted that she's constructed a mysterious, fanciful history for herself, and even began to believe it herself, but that the truth about her family is actually quite tragic (though it's never revealed). This may be why she's still a ghost; she hasn't "moved on" from whatever happened to them in life.