I love the idea of nitori always being invisible and painting herself so people can interact with her, or she's painting herself to match the background, appearing as though she were invisible.
Norondor said: this is the least-practical optical camouflage ever
Maybe not the most versatile style of optical camouflage, but it would be perfect for setting up an ambush of some sort, provided you knew ahead of time where your target was coming from...