Cliodna

Origin: Harry Potter
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Species: Human
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Residence: Atwood Street 13 (25-86)
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Talent: Magic, shape-shifting (sea bird)
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Languages: Irish Gaelic
Import Date: 5

An Animagus with the ability to turn into a sea bird, she was aided by three magical birds that cured the sick by singing them to sleep. It was also said that she could turn into a wave. She also discovered the properties of Moondew. Cliodne appeared on a Chocolate Frog Card.[1][2][3]
During the late 19th century, one of the residents in Irondale owned a brooch which was supposed to represent one of Cliodna's birds.[4]
In September of 1991, Harry Potter picked up a Chocolate Frog Card with a picture of Cliodna, who was scratching her nose.[5]

Magical abilities and skills
Potions: Cliodna was highly proficient with potions, as she discovered a new ingredient, Moondew and its properties in potion-making. Furthermore, she would have needed to have brewed the Animagus potion in order for her to gain the ability to fully transform, a potion known for being highly difficult, complex and time-consuming, showing her very impressive talent in the art of potion-making.
Transfiguration: She was also a mistress of transfiguration, being able to turn herself into a sea bird at will. Given how Human Transfiguration is an incredibly complex and even dangerous branch of transfiguration, this was a remarkable magical feat.