I lived with a pampered princess when I was at law college. She was the girlfriend of a good friend of mine and he introduced us and suggested we flatshare as she was looking for somewhere to live after she finished uni and started work. She seemed nice and we got on well, so we rented a flat together.
She was always telling people how she always managed to get her own way by batting her eyelids, because she was so "little and sweet."
She moved into the flat a few days after me and, despite us having agreed who was getting which room, she waited till I was out and then moved all my stuff out of my room and put hers in. Apparently she "just wanted that room." Somehow I let this go 
She later split up with her boyfriend and expected me to take over his role of ferrying her around and waiting on her hand and foot. She'd wake me up in the middle of the night if there was a moth or a spider in her room, or if she was bored. If I was going out and she had nothing to do, she'd insist on tagging along and would then demand that everyone changed their plans to whatever she fancied doing, and would then sulk if people refused.
She wanted me to drive her to work everyday - a one hour round trip after which I'd have to park the car at home and then get the bus to college. When I said no, she would try to force my hand by "oversleeping" and then crying and wailing that she would lose her job if I didn't take her. I took her a couple of times and then started refusing. She then woke me up early the morning before an exam and said she had an important breakfast meeting at work and needed a lift. I said no, so she threw a tantrum and quit her job.
She went out with someone I knew and when she was fed up with him she instructed me to dump him for her. When I refused, she sent him a message saying she needed to speak to him, so could he come round. She then went out without telling me he was coming, to try to force me to give him the bad news. He rang her and she told him I had something I needed to tell him, and hung up.
She eventually decided that life outside the family home was too hard and she preferred to be "daddy's little princess" - her words. She moved out without telling me, and when I rang her to ask where she was and why her rent hadn't been paid, she told me daddy wasn't paying the rent anymore as she wasn't living there, but she was going to leave her stuff in her room as she might come up to stay every now and again.
She then texted me to berate me for not getting her a birthday present, and when I told her I was moving out at the end of the tenancy, she demanded I box her stuff up and courier it to her! I refused and she eventually turned up in an almighty sulk, called me a selfish bitch and cried. Her dad rang me to apologise a few days later - but never offered to pay the rent she owed 