There's a ghost that lives in my apartment. She was young (when she died?) and looks to be about 7 or 8 years old. She wears a white dress, has short hair, and carries around a toy penguin with her.
Right after we moved into the apartment, we'd be sitting around playing video games, and suddenly the front door would just open. If we went out of town, we'd come back to find our dresser drawers open and all of our socks on the floor.
Now she rustles curtains and opens cabinet doors. She especially likes to do it if someone is sleeping on the couch, because the creaking of the cabinets will wake you up. She also has the ability, apparently, to set off alarms, like on clocks or watches. My sister had a watch one time and the ghost kept setting the alarm off, over and over, and it was scaring my sister, so my mom said to the room, "Ghostie Girl, you're scaring Missy. Please stop that," and the alarm stopped.
That's about it. Whenever she's doing someone, the cats usually crowd around her and just sit and watch.