Eridna

襟ドナ / エキドナ

Echidna, commonly known as Eridna, is an artificial spirit created by the Witch of Greed, Echidna, who is currently in service of Anastasia Hoshin. First introduced in Arc 5, she later plays a pivotal role in Arc 6 and a minor supporting character in Arc 8. (Source: Re:Zero Wiki)