I must say that she's fascinating, possibly the most responsive of all NPCs. Here is what I found:
- Effects that interest her (action): bike and maiko;
- Effects that make her move towards you (action): telephone, plaster cast, cake, trombone, schoolboy;
- Effects that make her slowly go away (action): twintails, penguin, haniwa, lantern;
- Effects that make her slowly go away (passive): chainsaw, insect, drum;
- Effects that make her move around you: boy (upon sitting, even if sitting as normal Urotsuki does the same), tall (action)
- Effects that induce total fear into her (passive. check that speed!): grave (finally some use!), marginal;
- Special effects: child (mini-shadow lady, goes to you), glasses (shadow lady form, passive), polygon (stays in place as a shadow lady upon changing form), invisible (turns invisible as well), fairy (spins around), spring (hops in place), bunny ears (hops around), spacesuit (gets confused), crossing (freezes in place/returns to normal), apple (comes towards you as a shadow lady, until the action ends), teru teru bozu (will attract her upon activating the effect), bat (stays in place, passive), tissue (stops for a few seconds, action).
The eyeball bomb and rainbow effects will be ignored. The bike-rider wolf form will make her leave (action), the gingerbread and raincoat form will elicit no response from her.
I also managed to turn her into a full shadow lady by annoying her with the teru teru bozu effect (maybe with the polygon effect as well). She would then not respond anymore to any effects and refuse to teleport Urotsuki back to the library. I couldn't redo it.