Grandeeney

Grandine is a female dragon known as the Sky Dragon. At one point in her life, she found and raised a human girl named Wendy Marvell. Grandine taught Wendy Dragon Slayer magic and also some healing magic. However, on July-7-777, Grandine disappeared, like all other revealed dragons in the series and left Wendy for reasons unknown.

Personality
Grandine seems to enjoy poking at people's sensitive areas. She is unafraid of making other dragons unhappy by bringing things up that are most likely a sore subject to them.

Tower of Heaven arc
In chapter 101, after the battle, Grandine ventures into a volcanic region to meet fellow dragon, Igneel. She started to make fun of Igneel's foster son Natsu Dragneel even to the point where she apparently threatened him. Hearing this Igneel ordered her to leave or else. Before leaving however, Grandine hoped Natsu would run into Wendy so a more friendly relationship could be made between the Dragon Slayers, unlike Natsu's "friendship" with Metalicana's foster son Gajeel Redfox.

Trivia

 * Grandine seems to be much smaller than other dragons
 * "Grandine" is the Italian word for "Hail".