Grandeeney

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

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

Tower of Paradise arc
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 Dragonil 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 Gazille Reitfox.

Trivia

 * Grandine seems to be much smaller than other dragons, however, she could have been communicating to Igneel in some form of magic.