[x] Open a window, toss him out with extreme prejudice.
-[x] Repeat as necessary if he comes back.
[x] "He has spare bodies. Killing one of them doesn't solve anything, but it does make him shut up for a little bit. And it's cathartic."
[x] "He offers a wish - a miracle, anything you want - in exchange for becoming a magical girl and fighting witches. Of course, he fails to mention the fine print of 'feeling negative emotions and using magic corrupts this thing'," hold up the soul gem, "and 'if it breaks, or if it gets too dark, you die'.
[x] "Enough about Kyubey. My point is that, what you two are doing? Making Tomo's home life a living hell? You're literally killing her."