Name: Signum Crucis
She's boastful, prideful, looks down on others and treats life like it's nothing.
She's an immortal whose purpose is unknown.
She likes to make fun of a specific person and consider her as her "rival" and causes all kinds of misery and trouble against that specific person for defeating her and letting her live. She was sealed but got out. The cause of her freedom is still not yet known but she's someone no one would ever want to hang out with.