Backdating: It won't bother me.
Threadjacking: Just ask permission first
4th Wall Breaking: Let's try to avoid that, shall we?
Hugging: Death loves hugs! So go right ahead.
Flirting: She may even go along with this.
Kissing/Other intimate stuff: It will take a very long time for you to get to this, or be smacked with a Magikarp.
Relationships: Death tries to avoid these, since bad things always happen to love lives when you're one of the Endless. If you want to take the dare, of course, you're more than welcome.
Violence: Knock yourself out!
Anything else: Ask a question and I'll be happy to answer.