Kororo

Kororo Corey in the english anime is the spirit ally of Usui Horokeu nicknamed Horohoro. Kororo is a Koropokkoru which means little people under butterbur leaves in Ainu and is surprisingly cute. Known as Minutians in the English anime and Horohoros spirit ally. She has a crush on Manta Oyamada even though he is human. Her name in the English anime version sounds similar to Kri which is the Japanese word for ice and also the element that Horohoros attacks are based on. Source: Wikipedia