I actually purposefully went over all of Natsumi's spells to make sure they weren't overpowered, which is one of the reasons why she took so long to write up. The only one of her abilities that could be considered gamebreaky is summoning Nyarlathotep, and even then that's only without the proper precautions that she's not going to do without because summoning Nyarlathotep without setting up a vast amount of precautions beforehand would be a very, very, [i]very[/i] stupid thing to do and the first thing that would happen afterwards if she did so would be her death.

If you still think she's overpowered, though, please read over her and point out what's wrong with her. I don't actually like playing as overpowered characters, as I find that rather boring and unchallenging, so if she's too powerful I'd really like to know, and know how.