I would like to start with the shamisen first, but only as a musical instrument, though I'm sure the schizo side of her had taken steps to hide a dagger in it. For the shikomizue, she would obtain it from a man who tried to take advantage of her. She would either have just obtained it at the start of the plot or she may obtain it later on, though I prefer the former. Her introduction would likely be a bloody or messy one.<br/><br/>I'll go with an amber eye color, since I've seen the differing eye color one to many times.<br/><br/>Well ... clients on the more sadistic side of the sexual spectrum adore the Exotic Geisha (is there a name for her) since she is known to take more than more girls and as you said, she has high optimism. If the schizo side of her feels that she is in any life-threatening danger, she will manifest and defend herself, using weapons she may have on hand or she will improvise. Also, due to her unusual atmosphere, I imagine she would have a bi-curious sexuality, but she may try to have it manifest later on in the story. At the start of the story she may just have a curiosity, but not motivation to let it manifest.<br/><br/>I wonder what the other geisha would be. I'm excited just for the person who plays her to discuss her characteristics.