koibana-chan: from 恋バナ (koibana), the abridged slang version of 恋話 (koibanashi). both of them mean love talk. she likes to gossip about other's supposed love lives. i also find it funny that since rendaku can make はな (hana) become ばな (bana), and 鼻 (nose) is read as はな, koibana has a heart shaped nose.