Eridanus

Eridanus the River is a Mirio's silver key.

Personality
Eridanus is a very impatient person, disliking people who don't answer her questions quickly enough. She's a very strict person, often criticizing the bad behavior and habits of other people and of Mirio, causing most of them to apologize, fearing that they might invoke her wrath.

Magic and Abilities
Water Magic: She can create and manipulate water, and also transform her entire body into water.

Ice Magic: Eridanus can invoke static strutures by her will. She can freeze water too.

Flight Magic: Eridanus can fly because she has wings, and they are very fast. She flies like a dragonfly, never staying at the same place for long.

Aerial Eyes: Her eyes glow at a pale blue light and she is capable of seeing at long distaces.

Fleuve d'étoiles or River of Stars: As the name suggests, it is a whip that has the rope section made of water, with stars of different sizes flowing and/or floating around it.

Trivia
Eridanus is based in High Pixie from Shin Megami.