Love at First Sight: Thanks to Twilight telling her about Ranma’s Jusenkyo curse right off the bat.
Green-Eyed Monster: While Ranma and Ukyo are on their date. She later admits that it’s because she thinks Ukyo knows Ranma a lot better than she does, but Ukyo reminds her that most of her memories of Ranma are from ten years ago.
Selective Obliviousness: After Tsukiko arranges for the Rivals to see the ponies’ true forms, Kodachi convinces herself they’re just really good costumes. Even when the WHOLE Mahoukaze clan gets ponified, she still is this.
Twin Maker: Thrice created duplicates of the Mane Cast. The first set had the personalites of them after he’d brainwashed them. The second set were more or less like them, but they were male. The third time was the Gone Horribly Right Queen Cosmos as a superclone.
Red Oni, Blue Oni: Shou is red, more outgoing, can be reckless at times, and prone to long rants about things that annoy him. Emi is blue, more rational, more sensible, and has a tendency to keep Shou in check when he's about to do something foolish.