Nora

Nora is a major character in Umineko: Revolt and the best friend to Ange Ushiromiya.

Story
At first, Nora is created by Blushii in his lair in order to infiltrate St. Lucia Academy and become a negative influence on Ange. Nora was made to be everything that Ange had wanted: A kind friend who reminded her of Maria, and someone who could teach her about magic.

However, as time went on, Nora begin to grow a real friendship with Ange, and during the rest of the story, the two of them fight against Blushii so Nora can gain her own independence.