Shimizu started life out as a cat, and through a quirk of sorcery was shapechanged into a human. Because of this, in times of stress she occasionally reverts to feline behavior - climbing curtains, chewing on shoes, or chasing her own tail. People also sometimes claim she purrs when finding a shiny on the ground.
Shimizu rarely accomplishes much in her adventures, as she gets distracted by absolutely every bit of fluff on the ground but is slowly amassing an impressive stockpile of random stuff.