I'd say the girl could start off a bit bitter, since ghosts are sprits with unfinished business most of the time, but over time becoming less and less broody.
I think we're good. Anything else we can specify later
I'll begin
Dave sighed standing outside of his new home. His father slapped his back proudly. "Ain't it a beauty son?"
Dave looked up at the two story house. He wasn't sure why his parents wanted a big place with the kids growing so fast, but he sure as he'll wasn't in the mood to argue.
"It's great dad"
"Davy come help with all these boxes! Your brother and I can't get it on our own"
From the top floor of the house, peeking thorough a basement window, Mary looked down on them as they moved in.
"Pft," she said to herself, "they'll probably be gone within the month..." She glared daggers at the new family as she said this, paying practically close attention to the young man moving in with them. If she had heard right, his name was Davy.
"Take these up to the attic will you?" He nodded and grabbed a few excess boxes. Reaching the attic he sat on them and contemplated.
"A month. Two tops. Then I get back onto the horse and find a real job" he mumbled to himself, not wanting to live his whole life labeled college dropout. He looked toward the window seeing a flicker of... Something
Mary saw him look at the window and ducked down by force of habit, but then stood up again, scoffing at herself.
'Idiot,' she thought to herself, 'he can't see you. No mortal can...' Yet she couldn't help but notice the way his eyes lingered, as if he had seen her. Shaking her head, she muttered, "impossible," and went back to watching them.