Something funny. I have no idea what "Improve Performance" does. It came with a script I used and I forgot to remove it in the rush. (Heck, now I'm not even sure if you can remove it.)
Positive X spells were originally enemy only, but near the end I realized Tamika was lacking in having many skills so I gave her those to save time when I really should have made original versions for her with unique names like I did for most of the spells.
I thought characters did have TP Persist. Perhaps something went wrong? I'll look into it when/if I can get around to fixing this game up post-Jam.
That said, thank you so much. Feedback is incredibly important. I will take all of this into account in future endeavors.