Leviathan

Leviathan (レヴィアタン Reviatan) is a water user mage from the land of Aquafall who makes friends with Bahamut and Jörmungandr while searching for her older brother. She can transform into a water-like dragon.Leviathan has blue hair and wears a light teal dress, she is always seen with her brothers staff (lance) that he left behind before he went away. When she transforms, she grows a sky blue tail with a pale green fin on the end, and also grows matching wings and horns, becoming a dragon.She has a shy personality, yearning for her brother's return. She also showing deep concern about people and events, and this causes her to lose her self-confidence at times.