Memetic Sex Goddess: Yuuna has started feeling attracted to her, although this might be due to her being compelled to think about her as a Replacement Goldfish for the Decadent Habits version of Akira Yuuna had sex with. Joker-chan and her father also showed signs of physical attraction for her. Word of God says this facet of her character will keep on increasing.
Making a Splash: Her Pactio with Itoshiki gives her a water-shooting umbrella.
The Fool: While meek and shy, her actions can have rather nasty consequences for those around her, like dumping her friends at a trash dump while they're unconscious and leaving them there while going looking for Itoshiki